Sync docs from v2.0.0.M4 to gh-pages

This commit is contained in:
buildmaster
2017-11-16 17:46:00 +00:00
parent 57d636820c
commit 7be1f23182
56 changed files with 3081 additions and 0 deletions

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/*
code highlight CSS resemblign the Eclipse IDE default color schema
@author Costin Leau
*/
.hl-keyword {
color: #7F0055;
font-weight: bold;
}
.hl-comment {
color: #3F5F5F;
font-style: italic;
}
.hl-multiline-comment {
color: #3F5FBF;
font-style: italic;
}
.hl-tag {
color: #3F7F7F;
}
.hl-attribute {
color: #7F007F;
}
.hl-value {
color: #2A00FF;
}
.hl-string {
color: #2A00FF;
}

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@IMPORT url("manual.css");
body.firstpage {
background: url("../images/background.png") no-repeat center top;
}
div.part h1 {
border-top: none;
}

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@IMPORT url("manual.css");
body {
background: url("../images/background.png") no-repeat center top;
}

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@IMPORT url("highlight.css");
html {
padding: 0pt;
margin: 0pt;
}
body {
color: #333333;
margin: 15px 30px;
font-family: Helvetica, Arial, Freesans, Clean, Sans-serif;
line-height: 1.6;
-webkit-font-smoothing: antialiased;
}
code {
font-size: 16px;
font-family: Consolas, "Liberation Mono", Courier, monospace;
}
:not(a)>code {
color: #6D180B;
}
:not(pre)>code {
background-color: #F2F2F2;
border: 1px solid #CCCCCC;
border-radius: 4px;
padding: 1px 3px 0;
text-shadow: none;
white-space: nowrap;
}
body>*:first-child {
margin-top: 0 !important;
}
div {
margin: 0pt;
}
hr {
border: 1px solid #CCCCCC;
background: #CCCCCC;
}
h1,h2,h3,h4,h5,h6 {
color: #000000;
cursor: text;
font-weight: bold;
margin: 30px 0 10px;
padding: 0;
}
h1,h2,h3 {
margin: 40px 0 10px;
}
h1 {
margin: 70px 0 30px;
padding-top: 20px;
}
div.part h1 {
border-top: 1px dotted #CCCCCC;
}
h1,h1 code {
font-size: 32px;
}
h2,h2 code {
font-size: 24px;
}
h3,h3 code {
font-size: 20px;
}
h4,h1 code,h5,h5 code,h6,h6 code {
font-size: 18px;
}
div.book,div.chapter,div.appendix,div.part,div.preface {
min-width: 300px;
max-width: 1200px;
margin: 0 auto;
}
p.releaseinfo {
font-weight: bold;
margin-bottom: 40px;
margin-top: 40px;
}
div.authorgroup {
line-height: 1;
}
p.copyright {
line-height: 1;
margin-bottom: -5px;
}
.legalnotice p {
font-style: italic;
font-size: 14px;
line-height: 1;
}
div.titlepage+p,div.titlepage+p {
margin-top: 0;
}
pre {
line-height: 1.0;
color: black;
}
a {
color: #4183C4;
text-decoration: none;
}
p {
margin: 15px 0;
text-align: left;
}
ul,ol {
padding-left: 30px;
}
li p {
margin: 0;
}
div.table {
margin: 1em;
padding: 0.5em;
text-align: center;
}
div.table table,div.informaltable table {
display: table;
width: 100%;
}
div.table td {
padding-left: 7px;
padding-right: 7px;
}
.sidebar {
line-height: 1.4;
padding: 0 20px;
background-color: #F8F8F8;
border: 1px solid #CCCCCC;
border-radius: 3px 3px 3px 3px;
}
.sidebar p.title {
color: #6D180B;
}
pre.programlisting,pre.screen {
font-size: 15px;
padding: 6px 10px;
background-color: #F8F8F8;
border: 1px solid #CCCCCC;
border-radius: 3px 3px 3px 3px;
clear: both;
overflow: auto;
line-height: 1.4;
font-family: Consolas, "Liberation Mono", Courier, monospace;
}
table {
border-collapse: collapse;
border-spacing: 0;
border: 1px solid #DDDDDD !important;
border-radius: 4px !important;
border-collapse: separate !important;
line-height: 1.6;
}
table thead {
background: #F5F5F5;
}
table tr {
border: none;
border-bottom: none;
}
table th {
font-weight: bold;
}
table th,table td {
border: none !important;
padding: 6px 13px;
}
table tr:nth-child(2n) {
background-color: #F8F8F8;
}
td p {
margin: 0 0 15px 0;
}
div.table-contents td p {
margin: 0;
}
div.important *,div.note *,div.tip *,div.warning *,div.navheader *,div.navfooter *,div.calloutlist *
{
border: none !important;
background: none !important;
margin: 0;
}
div.important p,div.note p,div.tip p,div.warning p {
color: #6F6F6F;
line-height: 1.6;
}
div.important code,div.note code,div.tip code,div.warning code {
background-color: #F2F2F2 !important;
border: 1px solid #CCCCCC !important;
border-radius: 4px !important;
padding: 1px 3px 0 !important;
text-shadow: none !important;
white-space: nowrap !important;
}
.note th,.tip th,.warning th {
display: none;
}
.note tr:first-child td,.tip tr:first-child td,.warning tr:first-child td
{
border-right: 1px solid #CCCCCC !important;
padding-top: 10px;
}
div.calloutlist p,div.calloutlist td {
padding: 0;
margin: 0;
}
div.calloutlist>table>tbody>tr>td:first-child {
padding-left: 10px;
width: 30px !important;
}
div.important,div.note,div.tip,div.warning {
margin-left: 0px !important;
margin-right: 20px !important;
margin-top: 20px;
margin-bottom: 20px;
padding-top: 10px;
padding-bottom: 10px;
}
div.toc {
line-height: 1.2;
}
dl,dt {
margin-top: 1px;
margin-bottom: 0;
}
div.toc>dl>dt {
font-size: 32px;
font-weight: bold;
margin: 30px 0 10px 0;
display: block;
}
div.toc>dl>dd>dl>dt {
font-size: 24px;
font-weight: bold;
margin: 20px 0 10px 0;
display: block;
}
div.toc>dl>dd>dl>dd>dl>dt {
font-weight: bold;
font-size: 20px;
margin: 10px 0 0 0;
}
tbody.footnotes * {
border: none !important;
}
div.footnote p {
margin: 0;
line-height: 1;
}
div.footnote p sup {
margin-right: 6px;
vertical-align: middle;
}
div.navheader {
border-bottom: 1px solid #CCCCCC;
}
div.navfooter {
border-top: 1px solid #CCCCCC;
}
.title {
margin-left: -1em;
padding-left: 1em;
}
.title>a {
position: absolute;
visibility: hidden;
display: block;
font-size: 0.85em;
margin-top: 0.05em;
margin-left: -1em;
vertical-align: text-top;
color: black;
}
.title>a:before {
content: "\00A7";
}
.title:hover>a,.title>a:hover,.title:hover>a:hover {
visibility: visible;
}
.title:focus>a,.title>a:focus,.title:focus>a:focus {
outline: 0;
}

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#!/bin/bash -x
set -e
# Set default props like MAVEN_PATH, ROOT_FOLDER etc.
function set_default_props() {
# The script should be executed from the root folder
ROOT_FOLDER=`pwd`
echo "Current folder is ${ROOT_FOLDER}"
if [[ ! -e "${ROOT_FOLDER}/.git" ]]; then
echo "You're not in the root folder of the project!"
exit 1
fi
# Prop that will let commit the changes
COMMIT_CHANGES="no"
MAVEN_PATH=${MAVEN_PATH:-}
echo "Path to Maven is [${MAVEN_PATH}]"
REPO_NAME=${PWD##*/}
echo "Repo name is [${REPO_NAME}]"
SPRING_CLOUD_STATIC_REPO=${SPRING_CLOUD_STATIC_REPO:-git@github.com:spring-cloud/spring-cloud-static.git}
echo "Spring Cloud Static repo is [${SPRING_CLOUD_STATIC_REPO}"
}
# Check if gh-pages exists and docs have been built
function check_if_anything_to_sync() {
git remote set-url --push origin `git config remote.origin.url | sed -e 's/^git:/https:/'`
if ! (git remote set-branches --add origin gh-pages && git fetch -q); then
echo "No gh-pages, so not syncing"
exit 0
fi
if ! [ -d docs/target/generated-docs ] && ! [ "${BUILD}" == "yes" ]; then
echo "No gh-pages sources in docs/target/generated-docs, so not syncing"
exit 0
fi
}
function retrieve_current_branch() {
# Code getting the name of the current branch. For master we want to publish as we did until now
# http://stackoverflow.com/questions/1593051/how-to-programmatically-determine-the-current-checked-out-git-branch
# If there is a branch already passed will reuse it - otherwise will try to find it
CURRENT_BRANCH=${BRANCH}
if [[ -z "${CURRENT_BRANCH}" ]] ; then
CURRENT_BRANCH=$(git symbolic-ref -q HEAD)
CURRENT_BRANCH=${CURRENT_BRANCH##refs/heads/}
CURRENT_BRANCH=${CURRENT_BRANCH:-HEAD}
fi
echo "Current branch is [${CURRENT_BRANCH}]"
git checkout ${CURRENT_BRANCH} || echo "Failed to check the branch... continuing with the script"
}
# Switches to the provided value of the release version. We always prefix it with `v`
function switch_to_tag() {
git checkout v${VERSION}
}
# Build the docs if switch is on
function build_docs_if_applicable() {
if [[ "${BUILD}" == "yes" ]] ; then
./mvnw clean install -P docs -pl docs -DskipTests
fi
}
# Get the name of the `docs.main` property
# Get whitelisted branches - assumes that a `docs` module is available under `docs` profile
function retrieve_doc_properties() {
MAIN_ADOC_VALUE=$("${MAVEN_PATH}"mvn -q \
-Dexec.executable="echo" \
-Dexec.args='${docs.main}' \
--non-recursive \
org.codehaus.mojo:exec-maven-plugin:1.3.1:exec)
echo "Extracted 'main.adoc' from Maven build [${MAIN_ADOC_VALUE}]"
WHITELIST_PROPERTY=${WHITELIST_PROPERTY:-"docs.whitelisted.branches"}
WHITELISTED_BRANCHES_VALUE=$("${MAVEN_PATH}"mvn -q \
-Dexec.executable="echo" \
-Dexec.args="\${${WHITELIST_PROPERTY}}" \
org.codehaus.mojo:exec-maven-plugin:1.3.1:exec \
-P docs \
-pl docs)
echo "Extracted '${WHITELIST_PROPERTY}' from Maven build [${WHITELISTED_BRANCHES_VALUE}]"
}
# Stash any outstanding changes
function stash_changes() {
git diff-index --quiet HEAD && dirty=$? || (echo "Failed to check if the current repo is dirty. Assuming that it is." && dirty="1")
if [ "$dirty" != "0" ]; then git stash; fi
}
# Switch to gh-pages branch to sync it with current branch
function add_docs_from_target() {
local DESTINATION_REPO_FOLDER
if [[ -z "${DESTINATION}" && -z "${CLONE}" ]] ; then
DESTINATION_REPO_FOLDER=${ROOT_FOLDER}
elif [[ "${CLONE}" == "yes" ]]; then
mkdir -p ${ROOT_FOLDER}/target
local clonedStatic=${ROOT_FOLDER}/target/spring-cloud-static
if [[ ! -e "${clonedStatic}/.git" ]]; then
echo "Cloning Spring Cloud Static to target"
git clone ${SPRING_CLOUD_STATIC_REPO} ${clonedStatic} && git checkout gh-pages
else
echo "Spring Cloud Static already cloned - will pull changes"
cd ${clonedStatic} && git checkout gh-pages && git pull origin gh-pages
fi
DESTINATION_REPO_FOLDER=${clonedStatic}/${REPO_NAME}
mkdir -p ${DESTINATION_REPO_FOLDER}
else
if [[ ! -e "${DESTINATION}/.git" ]]; then
echo "[${DESTINATION}] is not a git repository"
exit 1
fi
DESTINATION_REPO_FOLDER=${DESTINATION}/${REPO_NAME}
mkdir -p ${DESTINATION_REPO_FOLDER}
echo "Destination was provided [${DESTINATION}]"
fi
cd ${DESTINATION_REPO_FOLDER}
git checkout gh-pages
git pull origin gh-pages
# Add git branches
###################################################################
if [[ -z "${VERSION}" ]] ; then
copy_docs_for_current_version
else
copy_docs_for_provided_version
fi
commit_changes_if_applicable
}
# Copies the docs by using the retrieved properties from Maven build
function copy_docs_for_current_version() {
if [[ "${CURRENT_BRANCH}" == "master" ]] ; then
echo -e "Current branch is master - will copy the current docs only to the root folder"
for f in docs/target/generated-docs/*; do
file=${f#docs/target/generated-docs/*}
if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
# Not ignored...
cp -rf $f ${ROOT_FOLDER}/
git add -A ${ROOT_FOLDER}/$file
fi
done
COMMIT_CHANGES="yes"
else
echo -e "Current branch is [${CURRENT_BRANCH}]"
# http://stackoverflow.com/questions/29300806/a-bash-script-to-check-if-a-string-is-present-in-a-comma-separated-list-of-strin
if [[ ",${WHITELISTED_BRANCHES_VALUE}," = *",${CURRENT_BRANCH},"* ]] ; then
mkdir -p ${ROOT_FOLDER}/${CURRENT_BRANCH}
echo -e "Branch [${CURRENT_BRANCH}] is whitelisted! Will copy the current docs to the [${CURRENT_BRANCH}] folder"
for f in docs/target/generated-docs/*; do
file=${f#docs/target/generated-docs/*}
if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
# Not ignored...
# We want users to access 1.0.0.RELEASE/ instead of 1.0.0.RELEASE/spring-cloud.sleuth.html
if [[ "${file}" == "${MAIN_ADOC_VALUE}.html" ]] ; then
# We don't want to copy the spring-cloud-sleuth.html
# we want it to be converted to index.html
cp -rf $f ${ROOT_FOLDER}/${CURRENT_BRANCH}/index.html
git add -A ${ROOT_FOLDER}/${CURRENT_BRANCH}/index.html
else
cp -rf $f ${ROOT_FOLDER}/${CURRENT_BRANCH}
git add -A ${ROOT_FOLDER}/${CURRENT_BRANCH}/$file
fi
fi
done
COMMIT_CHANGES="yes"
else
echo -e "Branch [${CURRENT_BRANCH}] is not on the white list! Check out the Maven [${WHITELIST_PROPERTY}] property in
[docs] module available under [docs] profile. Won't commit any changes to gh-pages for this branch."
fi
fi
}
# Copies the docs by using the explicitly provided version
function copy_docs_for_provided_version() {
local FOLDER=${DESTINATION_REPO_FOLDER}/${VERSION}
mkdir -p ${FOLDER}
echo -e "Current tag is [v${VERSION}] Will copy the current docs to the [${FOLDER}] folder"
for f in ${ROOT_FOLDER}/docs/target/generated-docs/*; do
file=${f#${ROOT_FOLDER}/docs/target/generated-docs/*}
copy_docs_for_branch ${file} ${FOLDER}
done
COMMIT_CHANGES="yes"
CURRENT_BRANCH="v${VERSION}"
}
# Copies the docs from target to the provided destination
# Params:
# $1 - file from target
# $2 - destination to which copy the files
function copy_docs_for_branch() {
local file=$1
local destination=$2
if ! git ls-files -i -o --exclude-standard --directory | grep -q ^${file}$; then
# Not ignored...
# We want users to access 1.0.0.RELEASE/ instead of 1.0.0.RELEASE/spring-cloud.sleuth.html
if [[ ("${file}" == "${MAIN_ADOC_VALUE}.html") || ("${file}" == "${REPO_NAME}.html") ]] ; then
# We don't want to copy the spring-cloud-sleuth.html
# we want it to be converted to index.html
cp -rf $f ${destination}/index.html
git add -A ${destination}/index.html
else
cp -rf $f ${destination}
git add -A ${destination}/$file
fi
fi
}
function commit_changes_if_applicable() {
if [[ "${COMMIT_CHANGES}" == "yes" ]] ; then
COMMIT_SUCCESSFUL="no"
git commit -a -m "Sync docs from ${CURRENT_BRANCH} to gh-pages" && COMMIT_SUCCESSFUL="yes" || echo "Failed to commit changes"
# Uncomment the following push if you want to auto push to
# the gh-pages branch whenever you commit to master locally.
# This is a little extreme. Use with care!
###################################################################
if [[ "${COMMIT_SUCCESSFUL}" == "yes" ]] ; then
git push origin gh-pages
fi
fi
}
# Switch back to the previous branch and exit block
function checkout_previous_branch() {
# If -version was provided we need to come back to root project
cd ${ROOT_FOLDER}
git checkout ${CURRENT_BRANCH} || echo "Failed to check the branch... continuing with the script"
if [ "$dirty" != "0" ]; then git stash pop; fi
exit 0
}
# Assert if properties have been properly passed
function assert_properties() {
echo "VERSION [${VERSION}], DESTINATION [${DESTINATION}], CLONE [${CLONE}]"
if [[ "${VERSION}" != "" && (-z "${DESTINATION}" && -z "${CLONE}") ]] ; then echo "Version was set but destination / clone was not!"; exit 1;fi
if [[ ("${DESTINATION}" != "" && "${CLONE}" != "") && -z "${VERSION}" ]] ; then echo "Destination / clone was set but version was not!"; exit 1;fi
if [[ "${DESTINATION}" != "" && "${CLONE}" == "yes" ]] ; then echo "Destination and clone was set. Pick one!"; exit 1;fi
}
# Prints the usage
function print_usage() {
cat <<EOF
The idea of this script is to update gh-pages branch with the generated docs. Without any options
the script will work in the following manner:
- if there's no gh-pages / target for docs module then the script ends
- for master branch the generated docs are copied to the root of gh-pages branch
- for any other branch (if that branch is whitelisted) a subfolder with branch name is created
and docs are copied there
- if the version switch is passed (-v) then a tag with (v) prefix will be retrieved and a folder
with that version number will be created in the gh-pages branch. WARNING! No whitelist verification will take place
- if the destination switch is passed (-d) then the script will check if the provided dir is a git repo and then will
switch to gh-pages of that repo and copy the generated docs to `docs/<project-name>/<version>`
- if the destination switch is passed (-d) then the script will check if the provided dir is a git repo and then will
switch to gh-pages of that repo and copy the generated docs to `docs/<project-name>/<version>`
USAGE:
You can use the following options:
-v|--version - the script will apply the whole procedure for a particular library version
-d|--destination - the root of destination folder where the docs should be copied. You have to use the full path.
E.g. point to spring-cloud-static folder. Can't be used with (-c)
-b|--build - will run the standard build process after checking out the branch
-c|--clone - will automatically clone the spring-cloud-static repo instead of providing the destination.
Obviously can't be used with (-d)
EOF
}
# ==========================================
# ____ ____ _____ _____ _____ _______
# / ____|/ ____| __ \|_ _| __ \__ __|
# | (___ | | | |__) | | | | |__) | | |
# \___ \| | | _ / | | | ___/ | |
# ____) | |____| | \ \ _| |_| | | |
# |_____/ \_____|_| \_\_____|_| |_|
#
# ==========================================
while [[ $# > 0 ]]
do
key="$1"
case ${key} in
-v|--version)
VERSION="$2"
shift # past argument
;;
-d|--destination)
DESTINATION="$2"
shift # past argument
;;
-b|--build)
BUILD="yes"
;;
-c|--clone)
CLONE="yes"
;;
-h|--help)
print_usage
exit 0
;;
*)
echo "Invalid option: [$1]"
print_usage
exit 1
;;
esac
shift # past argument or value
done
assert_properties
set_default_props
check_if_anything_to_sync
if [[ -z "${VERSION}" ]] ; then
retrieve_current_branch
else
switch_to_tag
fi
build_docs_if_applicable
retrieve_doc_properties
stash_changes
add_docs_from_target
checkout_previous_branch

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.5">
<title>spring-cloud-gateway</title>
<link rel="stylesheet" href="css/manual-singlepage.css">
<style>
.hidden {
display: none;
}
.switch {
border-width: 1px 1px 0 1px;
border-style: solid;
border-color: #7a2518;
display: inline-block;
}
.switch--item {
padding: 10px;
background-color: #ffffff;
color: #7a2518;
display: inline-block;
cursor: pointer;
}
.switch--item.selected {
background-color: #7a2519;
color: #ffffff;
}
</style>
<script src="http://cdnjs.cloudflare.com/ajax/libs/zepto/1.2.0/zepto.min.js"></script>
<script type="text/javascript">
function addBlockSwitches() {
$('.primary').each(function() {
primary = $(this);
createSwitchItem(primary, createBlockSwitch(primary)).item.addClass("selected");
primary.children('.title').remove();
});
$('.secondary').each(function(idx, node) {
secondary = $(node);
primary = findPrimary(secondary);
switchItem = createSwitchItem(secondary, primary.children('.switch'));
switchItem.content.addClass('hidden');
findPrimary(secondary).append(switchItem.content);
secondary.remove();
});
}
function createBlockSwitch(primary) {
blockSwitch = $('<div class="switch"></div>');
primary.prepend(blockSwitch);
return blockSwitch;
}
function findPrimary(secondary) {
candidate = secondary.prev();
while (!candidate.is('.primary')) {
candidate = candidate.prev();
}
return candidate;
}
function createSwitchItem(block, blockSwitch) {
blockName = block.children('.title').text();
content = block.children('.content').first().append(block.next('.colist'));
item = $('<div class="switch--item">' + blockName + '</div>');
item.on('click', '', content, function(e) {
$(this).addClass('selected');
$(this).siblings().removeClass('selected');
e.data.siblings('.content').addClass('hidden');
e.data.removeClass('hidden');
});
blockSwitch.append(item);
return {'item': item, 'content': content};
}
$(addBlockSwitches);
</script>
</head>
<body class="article">
<div id="header">
<h1>spring-cloud-gateway</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>2.0.0.M4</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_pick_the_documentation_option">Pick The Documentation Option</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="single/spring-cloud-gateway.html">Single HTML</a></p>
</li>
<li>
<p><a href="multi/multi_spring-cloud-gateway.html">Multi HTML</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/prettify.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/prettify.min.js"></script>
<script>prettyPrint()</script>
</body>
</html>

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/*
code highlight CSS resemblign the Eclipse IDE default color schema
@author Costin Leau
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@IMPORT url("manual.css");
body.firstpage {
background: url("../images/background.png") no-repeat center top;
}
div.part h1 {
border-top: none;
}

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@IMPORT url("manual.css");
body {
background: url("../images/background.png") no-repeat center top;
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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>8.&nbsp;Actuator API</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi__configuration.html" title="7.&nbsp;Configuration"><link rel="next" href="multi__developer_guide.html" title="9.&nbsp;Developer Guide"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">8.&nbsp;Actuator API</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__configuration.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__developer_guide.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_actuator_api" href="#_actuator_api"></a>8.&nbsp;Actuator API</h1></div></div></div><p>TODO: document the <code class="literal">/gateway</code> actuator endpoint</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__configuration.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi__developer_guide.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">7.&nbsp;Configuration&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;9.&nbsp;Developer Guide</td></tr></table></div></body></html>

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>10.&nbsp;Building a Simple Gateway Using Spring MVC</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi__developer_guide.html" title="9.&nbsp;Developer Guide"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">10.&nbsp;Building a Simple Gateway Using Spring MVC</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__developer_guide.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;</td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_building_a_simple_gateway_using_spring_mvc" href="#_building_a_simple_gateway_using_spring_mvc"></a>10.&nbsp;Building a Simple Gateway Using Spring MVC</h1></div></div></div><p>Spring Cloud Gateway provides a utility object called <code class="literal">ProxyExchange</code> which you can use inside a regular Spring MVC handler as a method parameter. It supports basic downstream HTTP exchanges via methods that mirror the HTTP verbs, or forwarding to a local handler via the <code class="literal">forward()</code> method.</p><p>Example (proxying a request to "/test" downstream to a remote server):</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@RestController</span></em>
<em><span class="hl-annotation" style="color: gray">@SpringBootApplication</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> GatewaySampleApplication {
<em><span class="hl-annotation" style="color: gray">@Value("${remote.home}")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">private</span> URI home;
<em><span class="hl-annotation" style="color: gray">@GetMapping("/test")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> ResponseEntity&lt;?&gt; proxy(ProxyExchange&lt;Object&gt; proxy) <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">throws</span> Exception {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> proxy.uri(home.toString() + <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"/image/png"</span>).get();
}
}</pre><p>There are convenience methods on the <code class="literal">ProxyExchange</code> to enable the handler method to discover and enhance the URI path of the incoming request. For example you might want to extract the trailing elements of a path to pass them downstream:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@GetMapping("/proxy/path/**")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> ResponseEntity&lt;?&gt; proxyPath(ProxyExchange&lt;?&gt; proxy) <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">throws</span> Exception {
String path = proxy.path(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"/proxy/path/"</span>);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> proxy.uri(home.toString() + <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"/foos/"</span> + path).get();
}</pre><p>All the features of Spring MVC are available to Gateway handler methods. So you can inject request headers and query parameters, for instance, and you can constrain the incoming requests with declarations in the mapping annotation. See the documentation for <code class="literal">@RequestMapping</code> in Spring MVC for more details of those features.</p><p>Headers can be added to the downstream response using the <code class="literal">header()</code> methods on <code class="literal">ProxyExchange</code>.</p><p>You can also manipulate response headers (and anything else you like in the response) by adding a mapper to the <code class="literal">get()</code> etc. method. The mapper is a <code class="literal">Function</code> that takes the incoming <code class="literal">ResponseEntity</code> and converts it to an outgoing one.</p><p>First class support is provided for "sensitive" headers ("cookie" and "authorization" by default) which are not passed downstream, and for "proxy" headers (<code class="literal">x-forwarded-*</code>).</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__developer_guide.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;</td></tr><tr><td width="40%" align="left" valign="top">9.&nbsp;Developer Guide&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;</td></tr></table></div></body></html>

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>7.&nbsp;Configuration</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi__global_filters.html" title="6.&nbsp;Global Filters"><link rel="next" href="multi__actuator_api.html" title="8.&nbsp;Actuator API"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">7.&nbsp;Configuration</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__global_filters.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__actuator_api.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_configuration" href="#_configuration"></a>7.&nbsp;Configuration</h1></div></div></div><p>Configuration for Spring Cloud Gateway is driven by a collection of `RouteDefinitionLocator`s.</p><p><b>RouteDefinitionLocator.java.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">interface</span> RouteDefinitionLocator {
Flux&lt;RouteDefinition&gt; getRouteDefinitions();
}</pre><p>
</p><p>By default, a <code class="literal">PropertiesRouteDefinitionLocator</code> loads properties using Spring Boot&#8217;s <code class="literal">@ConfigurationProperties</code> mechanism.</p><p>The configuration examples above all use a shortcut notation that uses positional arguments rather than named ones. The two examples below are equivalent:</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: setstatus_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - name</span>: SetStatus
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> args</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> status</span>: <span class="hl-number">401</span>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: setstatusshortcut_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - SetStatus</span>=<span class="hl-number">401</span></pre><p>
</p><p>For some usages of the gateway, properties will be adequate, but some production use cases will benefit from loading configuration from an external source, such as a database. Future milestone versions will have <code class="literal">RouteDefinitionLocator</code> implementations based off of Spring Data Repositories such as: Redis, MongoDB and Cassandra.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_fluent_java_routes_api" href="#_fluent_java_routes_api"></a>7.1&nbsp;Fluent Java Routes API</h2></div></div></div><p>To allow for simple configuration in Java, there is a fluent API defined in the <code class="literal">Routes</code> class.</p><p><b>GatewaySampleApplication.java.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// static imports from GatewayFilters and RoutePredicates</span>
<em><span class="hl-annotation" style="color: gray">@Bean</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> RouteLocator customRouteLocator(ThrottleGatewayFilterFactory throttle) {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> Routes.locator()
.route(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test"</span>)
.predicate(host(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"**.abc.org"</span>).and(path(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"/image/png"</span>)))
.addResponseHeader(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"X-TestHeader"</span>, <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"foobar"</span>)
.uri(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"http://httpbin.org:80"</span>)
.route(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test2"</span>)
.predicate(path(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"/image/webp"</span>))
.add(addResponseHeader(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"X-AnotherHeader"</span>, <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"baz"</span>))
.uri(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"http://httpbin.org:80"</span>)
.route(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test3"</span>)
.order(-<span class="hl-number">1</span>)
.predicate(host(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"**.throttle.org"</span>).and(path(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"/get"</span>)))
.add(throttle.apply(tuple().of(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"capacity"</span>, <span class="hl-number">1</span>,
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"refillTokens"</span>, <span class="hl-number">1</span>,
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"refillPeriod"</span>, <span class="hl-number">10</span>,
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"refillUnit"</span>, <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"SECONDS"</span>)))
.uri(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"http://httpbin.org:80"</span>)
.build();
}</pre><p>
</p><p>This style also allows for more custom predicate assertions. The predicates defined by <code class="literal">RouteDefinitionLocator</code> beans are combined using logical <code class="literal">and</code>. By using the fluent Java API, you can use the <code class="literal">and()</code>, <code class="literal">or()</code> and <code class="literal">negate()</code> operators on the <code class="literal">Predicate</code> class.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__global_filters.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi__actuator_api.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.&nbsp;Global Filters&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;8.&nbsp;Actuator API</td></tr></table></div></body></html>

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<title>9.&nbsp;Developer Guide</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi__actuator_api.html" title="8.&nbsp;Actuator API"><link rel="next" href="multi__building_a_simple_gateway_using_spring_mvc.html" title="10.&nbsp;Building a Simple Gateway Using Spring MVC"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">9.&nbsp;Developer Guide</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__actuator_api.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__building_a_simple_gateway_using_spring_mvc.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_developer_guide" href="#_developer_guide"></a>9.&nbsp;Developer Guide</h1></div></div></div><p>TODO: overview of writing custom integrations</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_writing_custom_route_predicate_factories" href="#_writing_custom_route_predicate_factories"></a>9.1&nbsp;Writing Custom Route Predicate Factories</h2></div></div></div><p>TODO: document writing Custom Route Predicate Factories</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_writing_custom_gatewayfilter_factories" href="#_writing_custom_gatewayfilter_factories"></a>9.2&nbsp;Writing Custom GatewayFilter Factories</h2></div></div></div><p>TODO: document writing Custom GatewayFilter Factories</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_writing_custom_global_filters" href="#_writing_custom_global_filters"></a>9.3&nbsp;Writing Custom Global Filters</h2></div></div></div><p>TODO: document writing Custom Global Filters</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_writing_custom_route_locators_and_writers" href="#_writing_custom_route_locators_and_writers"></a>9.4&nbsp;Writing Custom Route Locators and Writers</h2></div></div></div><p>TODO: document writing Custom Route Locators and Writers</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__actuator_api.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi__building_a_simple_gateway_using_spring_mvc.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">8.&nbsp;Actuator API&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;10.&nbsp;Building a Simple Gateway Using Spring MVC</td></tr></table></div></body></html>

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<title>2.&nbsp;Glossary</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi_gateway-starter.html" title="1.&nbsp;How to Include Spring Cloud Gateway"><link rel="next" href="multi_gateway-how-it-works.html" title="3.&nbsp;How It Works"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.&nbsp;Glossary</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_gateway-starter.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-how-it-works.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_glossary" href="#_glossary"></a>2.&nbsp;Glossary</h1></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="strong"><strong>Route</strong></span>: Route the basic building block of the gateway. It is defined by an ID, a destination URI, a collection of predicates and a collection of filters. A route is matched if aggregate predicate is true.</li><li class="listitem"><span class="strong"><strong>Predicate</strong></span>: This is a <a class="link" href="http://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html" target="_top">Java 8 Function Predicate</a>. The input type is a <a class="link" href="http://docs.spring.io/spring/docs/5.0.x/javadoc-api/org/springframework/web/server/ServerWebExchange.html" target="_top">Spring Framework <code class="literal">ServerWebExchange</code></a>. This allows developers to match on anything from the HTTP request, such as headers or parameters.</li><li class="listitem"><span class="strong"><strong>Filter</strong></span>: These are instances <a class="link" href="http://docs.spring.io/spring/docs/5.0.x/javadoc-api/org/springframework/web/server/GatewayFilter.html" target="_top">Spring Framework <code class="literal">GatewayFilter</code></a> constructed in with a specific factory. Here, requests and responses can be modified before or after sending the downstream request.</li></ul></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_gateway-starter.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-how-it-works.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">1.&nbsp;How to Include Spring Cloud Gateway&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;3.&nbsp;How It Works</td></tr></table></div></body></html>

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<title>3.&nbsp;How It Works</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi__glossary.html" title="2.&nbsp;Glossary"><link rel="next" href="multi_gateway-request-predicates-factories.html" title="4.&nbsp;Route Predicate Factories"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3.&nbsp;How It Works</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__glossary.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-request-predicates-factories.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="gateway-how-it-works" href="#gateway-how-it-works"></a>3.&nbsp;How It Works</h1></div></div></div><div class="informalfigure"><div class="mediaobject"><img src="https://raw.githubusercontent.com/spring-cloud/spring-cloud-gateway/2.0.x/docs/src/main/asciidoc/images/spring_cloud_gateway_diagram.png" alt="Spring Cloud Gateway Diagram"></div></div><p>Clients make requests to Spring Cloud Gateway. If the Gateway Handler Mapping determines that a request matches a Route, it is sent to the Gateway Web Handler. This handler runs sends the request through a filter chain that is specific to the request. The reason the filters are divided by the dotted line, is that filters may execute logic before the proxy request is sent or after. All "pre" filter logic is executed, then the proxy request is made. After the proxy request is made, the "post" filter logic is executed.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__glossary.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-request-predicates-factories.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">2.&nbsp;Glossary&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;4.&nbsp;Route Predicate Factories</td></tr></table></div></body></html>

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<title>4.&nbsp;Route Predicate Factories</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi_gateway-how-it-works.html" title="3.&nbsp;How It Works"><link rel="next" href="multi_gateway-route-filters.html" title="5.&nbsp;GatewayFilter Factories"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.&nbsp;Route Predicate Factories</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_gateway-how-it-works.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-route-filters.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="gateway-request-predicates-factories" href="#gateway-request-predicates-factories"></a>4.&nbsp;Route Predicate Factories</h1></div></div></div><p>Spring Cloud Gateway matches routes as part of the Spring WebFlux <code class="literal">HandlerMapping</code> infrastructure. Spring Cloud Gateway includes many built-in Route Predicate Factories. All of these predicates match on different attributes of the HTTP request. Multiple Route Predicate Factories can be combined and are combined via logical <code class="literal">and</code>.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_after_route_predicate_factory" href="#_after_route_predicate_factory"></a>4.1&nbsp;After Route Predicate Factory</h2></div></div></div><p>The After Route Predicate Factory takes one parameter, a datetime. This predicate matches requests that happen after the current datetime.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: after_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - After</span>=<span class="hl-number">2017</span>-<span class="hl-number">01</span>-<span class="hl-number">20</span>T17:<span class="hl-number">42</span>:<span class="hl-number">47.789</span>-<span class="hl-number">07</span>:<span class="hl-number">00</span>[America/Denver<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">]</span></pre><p>
</p><p>This route matches any request after Jan 20, 2017 17:42 Mountain Time (Denver).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_before_route_predicate_factory" href="#_before_route_predicate_factory"></a>4.2&nbsp;Before Route Predicate Factory</h2></div></div></div><p>The Before Route Predicate Factory takes one parameter, a datetime. This predicate matches requests that happen before the current datetime.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: before_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Before</span>=<span class="hl-number">2017</span>-<span class="hl-number">01</span>-<span class="hl-number">20</span>T17:<span class="hl-number">42</span>:<span class="hl-number">47.789</span>-<span class="hl-number">07</span>:<span class="hl-number">00</span>[America/Denver<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">]</span></pre><p>
</p><p>This route matches any request before Jan 20, 2017 17:42 Mountain Time (Denver).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_between_route_predicate_factory" href="#_between_route_predicate_factory"></a>4.3&nbsp;Between Route Predicate Factory</h2></div></div></div><p>The Between Route Predicate Factory takes two parameters, datetime1 and datetime2. This predicate matches requests that happen after datetime1 and before datetime2. The datetime2 parameter must be after datetime1.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: between_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Betweeen</span>=<span class="hl-number">2017</span>-<span class="hl-number">01</span>-<span class="hl-number">20</span>T17:<span class="hl-number">42</span>:<span class="hl-number">47.789</span>-<span class="hl-number">07</span>:<span class="hl-number">00</span>[America/Denver]<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> <span class="hl-number">2017</span>-<span class="hl-number">01</span>-<span class="hl-number">21</span>T17:<span class="hl-number">42</span>:<span class="hl-number">47.789</span>-<span class="hl-number">07</span>:<span class="hl-number">00</span>[America/Denver<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">]</span></pre><p>
</p><p>This route matches any request after Jan 20, 2017 17:42 Mountain Time (Denver) and before Jan 21, 2017 17:42 Mountain Time (Denver). This could be useful for maintenance windows.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_cookie_route_predicate_factory" href="#_cookie_route_predicate_factory"></a>4.4&nbsp;Cookie Route Predicate Factory</h2></div></div></div><p>The Cookie Route Predicate Factory takes two parameters, the cookie name and a regular expression. This predicate matches cookies that have the given name and the value matches the regular expression.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: cookie_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Cookie</span>=chocolate<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> ch.p</pre><p>
</p><p>This route matches the request has a cookie named <code class="literal">chocolate</code> who&#8217;s value matches the <code class="literal">ch.p</code> regular expression.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_header_route_predicate_factory" href="#_header_route_predicate_factory"></a>4.5&nbsp;Header Route Predicate Factory</h2></div></div></div><p>The Header Route Predicate Factory takes two parameters, the header name and a regular expression. This predicate matches with a header that has the given name and the value matches the regular expression.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: header_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Header</span>=X-Request-Id<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> \d+</pre><p>
</p><p>This route matches if the request has a header named <code class="literal">X-Request-Id</code> whos value matches the <code class="literal">\d+</code> regular expression (has a value of one or more digits).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_host_route_predicate_factory" href="#_host_route_predicate_factory"></a>4.6&nbsp;Host Route Predicate Factory</h2></div></div></div><p>The Host Route Predicate Factory takes one parameter: the host name pattern. The pattern is an Ant style pattern with <code class="literal">.</code> as the separator. This predicates matches the <code class="literal">Host</code> header that matches the pattern.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: host_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Host</span>=**.somehost.org</pre><p>
</p><p>This route would match if the request has a <code class="literal">Host</code> header has the value <code class="literal">www.somehost.org</code> or <code class="literal">beta.somehost.org</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_method_route_predicate_factory" href="#_method_route_predicate_factory"></a>4.7&nbsp;Method Route Predicate Factory</h2></div></div></div><p>The Method Route Predicate Factory takes one parameter: the HTTP method to match.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: method_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Method</span>=GET</pre><p>
</p><p>This route would match if the request method was a <code class="literal">GET</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_path_route_predicate_factory" href="#_path_route_predicate_factory"></a>4.8&nbsp;Path Route Predicate Factory</h2></div></div></div><p>The Path Route Predicate Factory takes one parameter: a Spring <code class="literal">PathMatcher</code> pattern.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: host_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Path</span>=/foo/{segment<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span></pre><p>
</p><p>This route would match if the request path was, for example: <code class="literal">/foo/1</code> or <code class="literal">/foo/bar</code>.</p><p>This predicate extracts the URI template variables (like <code class="literal">segment</code> defined in the example above) as a map of names and values and places it in the <code class="literal">ServerWebExchange.getAttributes()</code> with a key defined in <code class="literal">PathRoutePredicate.URL_PREDICATE_VARS_ATTR</code>. Those values are then available for use by <a class="link" href="multi_gateway-route-filters.html" title="5.&nbsp;GatewayFilter Factories">GatewayFilter Factories</a></p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_query_route_predicate_factory" href="#_query_route_predicate_factory"></a>4.9&nbsp;Query Route Predicate Factory</h2></div></div></div><p>The Query Route Predicate Factory takes two parameters: a required <code class="literal">param</code> and an optional <code class="literal">regexp</code>.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: query_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Query</span>=baz</pre><p>
</p><p>This route would match if the request contained a <code class="literal">baz</code> query parameter.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: query_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Query</span>=foo<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> ba.</pre><p>
</p><p>This route would match if the request contained a <code class="literal">foo</code> query parameter whose value matched the <code class="literal">ba.</code> regexp, so <code class="literal">bar</code> and <code class="literal">baz</code> would match.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_remoteaddr_route_predicate_factory" href="#_remoteaddr_route_predicate_factory"></a>4.10&nbsp;RemoteAddr Route Predicate Factory</h2></div></div></div><p>The RemoteAddr Route Predicate Factory takes a list (min size 1) of CIDR-notation strings, e.g. <code class="literal">192.168.0.1/16</code> (where <code class="literal">192.168.0.1</code> is an IP address and <code class="literal">16</code> is a subnet mask.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: remoteaddr_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - RemoteAddr</span>=<span class="hl-number">192.168</span>.<span class="hl-number">1.1</span>/<span class="hl-number">24</span></pre><p>
</p><p>This route would match if the remote address of the request was, for example, <code class="literal">192.168.1.10</code>.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_gateway-how-it-works.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-route-filters.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.&nbsp;How It Works&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;5.&nbsp;GatewayFilter Factories</td></tr></table></div></body></html>

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<title>5.&nbsp;GatewayFilter Factories</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi_gateway-request-predicates-factories.html" title="4.&nbsp;Route Predicate Factories"><link rel="next" href="multi__global_filters.html" title="6.&nbsp;Global Filters"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.&nbsp;GatewayFilter Factories</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_gateway-request-predicates-factories.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__global_filters.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="gateway-route-filters" href="#gateway-route-filters"></a>5.&nbsp;GatewayFilter Factories</h1></div></div></div><p>Route filters allow the modification of the incoming HTTP request or outgoing HTTP response in some manner. Route filters are scoped to a particular route. Spring Cloud Gateway includes many built-in GatewayFilter Factories.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_addrequestheader_gatewayfilter_factory" href="#_addrequestheader_gatewayfilter_factory"></a>5.1&nbsp;AddRequestHeader GatewayFilter Factory</h2></div></div></div><p>The AddRequestHeader GatewayFilter Factory takes a name and value parameter.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: add_request_header_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - AddRequestHeader</span>=X-Request-Foo<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> Bar</pre><p>
</p><p>This will add <code class="literal">X-Request-Foo:Bar</code> header to the downstream request&#8217;s headers for all matching requests.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_addrequestparameter_gatewayfilter_factory" href="#_addrequestparameter_gatewayfilter_factory"></a>5.2&nbsp;AddRequestParameter GatewayFilter Factory</h2></div></div></div><p>The AddRequestParameter GatewayFilter Factory takes a name and value parameter.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: add_request_parameter_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - AddRequestParameter</span>=foo<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> bar</pre><p>
</p><p>This will add <code class="literal">foo=bar</code> to the downstream request&#8217;s query string for all matching requests.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_addresponseheader_gatewayfilter_factory" href="#_addresponseheader_gatewayfilter_factory"></a>5.3&nbsp;AddResponseHeader GatewayFilter Factory</h2></div></div></div><p>The AddResponseHeader GatewayFilter Factory takes a name and value parameter.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: add_request_header_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - AddResponseHeader</span>=X-Response-Foo<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> Bar</pre><p>
</p><p>This will add <code class="literal">X-Response-Foo:Bar</code> header to the downstream response&#8217;s headers for all matching requests.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_hystrix_gatewayfilter_factory" href="#_hystrix_gatewayfilter_factory"></a>5.4&nbsp;Hystrix GatewayFilter Factory</h2></div></div></div><p>The Hystrix GatewayFilter Factory takes a single <code class="literal">name</code> parameters, which is the name of the <code class="literal">HystrixCommand</code>. (More options might be added in future releases).</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: hytstrix_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Hystrix</span>=myCommandName</pre><p>
</p><p>This wraps the remaining filters in a <code class="literal">HystrixCommand</code> with command name <code class="literal">myCommandName</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_prefixpath_gatewayfilter_factory" href="#_prefixpath_gatewayfilter_factory"></a>5.5&nbsp;PrefixPath GatewayFilter Factory</h2></div></div></div><p>The PrefixPath GatewayFilter Factory takes a single <code class="literal">prefix</code> parameter.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: prefixpath_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - PrefixPath</span>=/mypath</pre><p>
</p><p>This will prefix <code class="literal">/mypath</code> to the path of all matching requests. So a request to <code class="literal">/hello</code>, would be sent to <code class="literal">/mypath/hello</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_requestratelimiter_gatewayfilter_factory" href="#_requestratelimiter_gatewayfilter_factory"></a>5.6&nbsp;RequestRateLimiter GatewayFilter Factory</h2></div></div></div><p>The RequestRateLimiter GatewayFilter Factory takes three parameters: <code class="literal">replenishRate</code>, <code class="literal">burstCapacity</code> &amp; <code class="literal">keyResolverName</code>.</p><p><code class="literal">replenishRate</code> is how many requests per second do you want a user to be allowed to do.</p><p><code class="literal">burstCapacity</code> TODO: document burst capacity</p><p><code class="literal">keyResolver</code> is a bean that implements the <code class="literal">KeyResolver</code> interface. In configuration, reference the bean by name using SpEL. <code class="literal">#{@myKeyResolver}</code> is a SpEL expression referencing a bean with the name <code class="literal">myKeyResolver</code>.</p><p><b>KeyResolver.java.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">interface</span> KeyResolver {
Mono&lt;String&gt; resolve(ServerWebExchange exchange);
}</pre><p>
</p><p>The <code class="literal">KeyResolver</code> interface allows pluggable strategies to derive the key for limiting requests. In future milestones, there will be some <code class="literal">KeyResolver</code> implementations.</p><p>The redis implementation is based off of work done at <a class="link" href="https://stripe.com/blog/rate-limiters" target="_top">Stripe</a>. It requires the use of the <code class="literal">spring-boot-starter-data-redis-reactive</code> Spring Boot starter.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: requestratelimiter_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - RequestRateLimiter</span>=<span class="hl-number">10</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> <span class="hl-number">20</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">#{@userKeyResolver}</span></pre><p>
</p><p><b>Config.java.&nbsp;</b>
</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Bean</span></em>
KeyResolver userKeyResolver() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> exchange -&gt; Mono.just(exchange.getRequest().getQueryParams().getFirst(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"user"</span>));
}</pre><p>
</p><p>This defines a request rate limit of 10 per user. The <code class="literal">KeyResolver</code> is a simple one that gets the <code class="literal">user</code> request parameter (note: this is not recommended for production).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_redirectto_gatewayfilter_factory" href="#_redirectto_gatewayfilter_factory"></a>5.7&nbsp;RedirectTo GatewayFilter Factory</h2></div></div></div><p>The RedirectTo GatewayFilter Factory takes a <code class="literal">status</code> and a <code class="literal">url</code> parameter. The status should be a 300 series redirect http code, such as 301. The url should be a valid url. This will be the value of the <code class="literal">Location</code> header.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: prefixpath_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - RedirectTo</span>=<span class="hl-number">302</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> http://acme.org</pre><p>
</p><p>This will send a status 302 with a <code class="literal">Location:http://acme.org</code> header to perform a redirect.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_removenonproxyheaders_gatewayfilter_factory" href="#_removenonproxyheaders_gatewayfilter_factory"></a>5.8&nbsp;RemoveNonProxyHeaders GatewayFilter Factory</h2></div></div></div><p>The RemoveNonProxyHeaders GatewayFilter Factory removes headers from forwarded requests. The default list of headers that is removed comes from the <a class="link" href="https://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-14#section-7.1.3" target="_top">IETF</a>.</p><div class="itemizedlist"><p class="title"><b>The default removed headers are:</b></p><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Connection</li><li class="listitem">Keep-Alive</li><li class="listitem">Proxy-Authenticate</li><li class="listitem">Proxy-Authorization</li><li class="listitem">TE</li><li class="listitem">Trailer</li><li class="listitem">Transfer-Encoding</li><li class="listitem">Upgrade</li></ul></div><p>To change this, set the <code class="literal">spring.cloud.gateway.filter.remove-non-proxy-headers.headers</code> property to the list of header names to remove.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_removerequestheader_gatewayfilter_factory" href="#_removerequestheader_gatewayfilter_factory"></a>5.9&nbsp;RemoveRequestHeader GatewayFilter Factory</h2></div></div></div><p>The RemoveRequestHeader GatewayFilter Factory takes a <code class="literal">name</code> parameter. It is the name of the header to be removed.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: removerequestheader_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - RemoveRequestHeader</span>=X-Request-Foo</pre><p>
</p><p>This will remove the <code class="literal">X-Request-Foo</code> header before it is sent downstream.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_removeresponseheader_gatewayfilter_factory" href="#_removeresponseheader_gatewayfilter_factory"></a>5.10&nbsp;RemoveResponseHeader GatewayFilter Factory</h2></div></div></div><p>The RemoveResponseHeader GatewayFilter Factory takes a <code class="literal">name</code> parameter. It is the name of the header to be removed.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: removeresponseheader_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - RemoveResponseHeader</span>=X-Response-Foo</pre><p>
</p><p>This will remove the <code class="literal">X-Response-Foo</code> header from the response before it is returned to the gateway client.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_rewritepath_gatewayfilter_factory" href="#_rewritepath_gatewayfilter_factory"></a>5.11&nbsp;RewritePath GatewayFilter Factory</h2></div></div></div><p>The RewritePath GatewayFilter Factory takes a path <code class="literal">regexp</code> parameter and a <code class="literal">replacement</code> parameter. This uses Java regular expressions for a flexible way to rewrite the request path.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: rewritepath_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Path</span>=/foo/**
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - RewritePath</span>=/foo/(?&lt;segment&gt;.*)<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> /$\{segment<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span></pre><p>
</p><p>For a request path of <code class="literal">/foo/bar</code>, this will set the path to <code class="literal">/bar</code> before making the downstream request. Notice the <code class="literal">$\</code> which is replaced with <code class="literal">$</code> because of the YAML spec.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_secureheaders_gatewayfilter_factory" href="#_secureheaders_gatewayfilter_factory"></a>5.12&nbsp;SecureHeaders GatewayFilter Factory</h2></div></div></div><p>The SecureHeaders GatewayFilter Factory adds a number of headers to the response at the reccomendation from <a class="link" href="https://blog.appcanary.com/2017/http-security-headers.html" target="_top">this blog post</a>.</p><div class="itemizedlist"><p class="title"><b>The following headers are added (allong with default values):</b></p><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><code class="literal">X-Xss-Protection:1; mode=block</code></li><li class="listitem"><code class="literal">Strict-Transport-Security:max-age=631138519</code></li><li class="listitem"><code class="literal">X-Frame-Options:DENY</code></li><li class="listitem"><code class="literal">X-Content-Type-Options:nosniff</code></li><li class="listitem"><code class="literal">Referrer-Policy:no-referrer</code></li><li class="listitem"><code class="literal">Content-Security-Policy:default-src 'self' https:; font-src 'self' https: data:; img-src 'self' https: data:; object-src 'none'; script-src https:; style-src 'self' https: 'unsafe-inline'</code></li><li class="listitem"><code class="literal">X-Download-Options:noopen</code></li><li class="listitem"><code class="literal">X-Permitted-Cross-Domain-Policies:none</code></li></ul></div><p>To change the default values set the appropriate property in the <code class="literal">spring.cloud.gateway.filter.secure-headers</code> namespace:</p><div class="itemizedlist"><p class="title"><b>Property to change:</b></p><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><code class="literal">xss-protection-header</code></li><li class="listitem"><code class="literal">strict-transport-security</code></li><li class="listitem"><code class="literal">frame-options</code></li><li class="listitem"><code class="literal">content-type-options</code></li><li class="listitem"><code class="literal">referrer-policy</code></li><li class="listitem"><code class="literal">content-security-policy</code></li><li class="listitem"><code class="literal">download-options</code></li><li class="listitem"><code class="literal">permitted-cross-domain-policies</code></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_setpath_gatewayfilter_factory" href="#_setpath_gatewayfilter_factory"></a>5.13&nbsp;SetPath GatewayFilter Factory</h2></div></div></div><p>The SetPath GatewayFilter Factory takes a path <code class="literal">template</code> parameter. It offers a simple way to manipulate the request path by allowing templated segments of the path. This uses the uri templates from Spring Framework. Multiple matching segments are allowed.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: setpath_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> predicates</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - Path</span>=/foo/{segment<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - SetPath</span>=/{segment<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span></pre><p>
</p><p>For a request path of <code class="literal">/foo/bar</code>, this will set the path to <code class="literal">/bar</code> before making the downstream request.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_setresponseheader_gatewayfilter_factory" href="#_setresponseheader_gatewayfilter_factory"></a>5.14&nbsp;SetResponseHeader GatewayFilter Factory</h2></div></div></div><p>The SetResponseHeader GatewayFilter Factory takes <code class="literal">name</code> and <code class="literal">value</code> parameters.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: setresponseheader_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - SetResponseHeader</span>=X-Response-Foo<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span> Bar</pre><p>
</p><p>This GatewayFilter replaces all headers with the given name, rather than adding. So if the downstream server responded with a <code class="literal">X-Response-Foo:1234</code>, this would be replaced with <code class="literal">X-Response-Foo:Bar</code>, which is what the gateway client would receive.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_setstatus_gatewayfilter_factory" href="#_setstatus_gatewayfilter_factory"></a>5.15&nbsp;SetStatus GatewayFilter Factory</h2></div></div></div><p>The SetStatus GatewayFilter Factory takes a single <code class="literal">status</code> parameter. It must be a valid Spring <code class="literal">HttpStatus</code>. It may be the integer value <code class="literal">404</code> or the string representation of the enumeration <code class="literal">NOT_FOUND</code>.</p><p><b>application.yml.&nbsp;</b>
</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> cloud</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> gateway</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> routes</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> # </span>=====================================
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: setstatusstring_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - SetStatus</span>=BAD_REQUEST
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - id</span>: setstatusint_route
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> uri</span>: http://example.org
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> filters</span>:
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute"> - SetStatus</span>=<span class="hl-number">401</span></pre><p>
</p><p>In either case, the HTTP status of the response will be set to 401.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_gateway-request-predicates-factories.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi__global_filters.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">4.&nbsp;Route Predicate Factories&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;6.&nbsp;Global Filters</td></tr></table></div></body></html>

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>1.&nbsp;How to Include Spring Cloud Gateway</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi_pr01.html" title=""><link rel="next" href="multi__glossary.html" title="2.&nbsp;Glossary"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.&nbsp;How to Include Spring Cloud Gateway</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__glossary.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="gateway-starter" href="#gateway-starter"></a>1.&nbsp;How to Include Spring Cloud Gateway</h1></div></div></div><p>To include Spring Cloud Gateway in your project use the starter with group <code class="literal">org.springframework.cloud</code>
and artifact id <code class="literal">spring-cloud-starter-gateway</code>. See the <a class="link" href="http://projects.spring.io/spring-cloud/" target="_top">Spring Cloud Project page</a>
for details on setting up your build system with the current Spring Cloud Release Train.</p><p>If you include the starter, but, for some reason, you do not want the gateway to be enabled, set <code class="literal">spring.cloud.gateway.enabled=false</code>.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi__glossary.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;2.&nbsp;Glossary</td></tr></table></div></body></html>

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title></title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="up" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="prev" href="multi_spring-cloud-gateway.html" title="Spring Cloud Gateway"><link rel="next" href="multi_gateway-starter.html" title="1.&nbsp;How to Include Spring Cloud Gateway"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-gateway.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-starter.html">Next</a></td></tr></table><hr></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p><span class="strong"><strong>2.0.0.M4</strong></span></p><p>This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 5, Spring Boot 2 and Project Reactor. Spring Cloud Gateway aims to provide a simple, yet effective way to route to APIs and provide cross cutting concerns to them such as: security, monitoring/metrics, and resiliency.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_spring-cloud-gateway.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi_gateway-starter.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Spring Cloud Gateway&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-gateway.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;1.&nbsp;How to Include Spring Cloud Gateway</td></tr></table></div></body></html>

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<info>
<title>Spring Cloud Gateway</title>
<date>2017-11-16</date>
</info>
<preface>
<title></title>
<simpara><emphasis role="strong">2.0.0.M4</emphasis></simpara>
<simpara>This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 5, Spring Boot 2 and Project Reactor. Spring Cloud Gateway aims to provide a simple, yet effective way to route to APIs and provide cross cutting concerns to them such as: security, monitoring/metrics, and resiliency.</simpara>
</preface>
<chapter xml:id="gateway-starter">
<title>How to Include Spring Cloud Gateway</title>
<simpara>To include Spring Cloud Gateway in your project use the starter with group <literal>org.springframework.cloud</literal>
and artifact id <literal>spring-cloud-starter-gateway</literal>. See the <link xl:href="http://projects.spring.io/spring-cloud/">Spring Cloud Project page</link>
for details on setting up your build system with the current Spring Cloud Release Train.</simpara>
<simpara>If you include the starter, but, for some reason, you do not want the gateway to be enabled, set <literal>spring.cloud.gateway.enabled=false</literal>.</simpara>
</chapter>
<chapter xml:id="_glossary">
<title>Glossary</title>
<itemizedlist>
<listitem>
<simpara><emphasis role="strong">Route</emphasis>: Route the basic building block of the gateway. It is defined by an ID, a destination URI, a collection of predicates and a collection of filters. A route is matched if aggregate predicate is true.</simpara>
</listitem>
<listitem>
<simpara><emphasis role="strong">Predicate</emphasis>: This is a <link xl:href="http://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html">Java 8 Function Predicate</link>. The input type is a <link xl:href="http://docs.spring.io/spring/docs/5.0.x/javadoc-api/org/springframework/web/server/ServerWebExchange.html">Spring Framework <literal>ServerWebExchange</literal></link>. This allows developers to match on anything from the HTTP request, such as headers or parameters.</simpara>
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<listitem>
<simpara><emphasis role="strong">Filter</emphasis>: These are instances <link xl:href="http://docs.spring.io/spring/docs/5.0.x/javadoc-api/org/springframework/web/server/GatewayFilter.html">Spring Framework <literal>GatewayFilter</literal></link> constructed in with a specific factory. Here, requests and responses can be modified before or after sending the downstream request.</simpara>
</listitem>
</itemizedlist>
</chapter>
<chapter xml:id="gateway-how-it-works">
<title>How It Works</title>
<informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="https://raw.githubusercontent.com/spring-cloud/spring-cloud-gateway/2.0.x/docs/src/main/asciidoc/images/spring_cloud_gateway_diagram.png"/>
</imageobject>
<textobject><phrase>Spring Cloud Gateway Diagram</phrase></textobject>
</mediaobject>
</informalfigure>
<simpara>Clients make requests to Spring Cloud Gateway. If the Gateway Handler Mapping determines that a request matches a Route, it is sent to the Gateway Web Handler. This handler runs sends the request through a filter chain that is specific to the request. The reason the filters are divided by the dotted line, is that filters may execute logic before the proxy request is sent or after. All "pre" filter logic is executed, then the proxy request is made. After the proxy request is made, the "post" filter logic is executed.</simpara>
</chapter>
<chapter xml:id="gateway-request-predicates-factories">
<title>Route Predicate Factories</title>
<simpara>Spring Cloud Gateway matches routes as part of the Spring WebFlux <literal>HandlerMapping</literal> infrastructure. Spring Cloud Gateway includes many built-in Route Predicate Factories. All of these predicates match on different attributes of the HTTP request. Multiple Route Predicate Factories can be combined and are combined via logical <literal>and</literal>.</simpara>
<section xml:id="_after_route_predicate_factory">
<title>After Route Predicate Factory</title>
<simpara>The After Route Predicate Factory takes one parameter, a datetime. This predicate matches requests that happen after the current datetime.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: after_route
uri: http://example.org
predicates:
- After=2017-01-20T17:42:47.789-07:00[America/Denver]</programlisting>
</para>
</formalpara>
<simpara>This route matches any request after Jan 20, 2017 17:42 Mountain Time (Denver).</simpara>
</section>
<section xml:id="_before_route_predicate_factory">
<title>Before Route Predicate Factory</title>
<simpara>The Before Route Predicate Factory takes one parameter, a datetime. This predicate matches requests that happen before the current datetime.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: before_route
uri: http://example.org
predicates:
- Before=2017-01-20T17:42:47.789-07:00[America/Denver]</programlisting>
</para>
</formalpara>
<simpara>This route matches any request before Jan 20, 2017 17:42 Mountain Time (Denver).</simpara>
</section>
<section xml:id="_between_route_predicate_factory">
<title>Between Route Predicate Factory</title>
<simpara>The Between Route Predicate Factory takes two parameters, datetime1 and datetime2. This predicate matches requests that happen after datetime1 and before datetime2. The datetime2 parameter must be after datetime1.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: between_route
uri: http://example.org
predicates:
- Betweeen=2017-01-20T17:42:47.789-07:00[America/Denver], 2017-01-21T17:42:47.789-07:00[America/Denver]</programlisting>
</para>
</formalpara>
<simpara>This route matches any request after Jan 20, 2017 17:42 Mountain Time (Denver) and before Jan 21, 2017 17:42 Mountain Time (Denver). This could be useful for maintenance windows.</simpara>
</section>
<section xml:id="_cookie_route_predicate_factory">
<title>Cookie Route Predicate Factory</title>
<simpara>The Cookie Route Predicate Factory takes two parameters, the cookie name and a regular expression. This predicate matches cookies that have the given name and the value matches the regular expression.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: cookie_route
uri: http://example.org
predicates:
- Cookie=chocolate, ch.p</programlisting>
</para>
</formalpara>
<simpara>This route matches the request has a cookie named <literal>chocolate</literal> who&#8217;s value matches the <literal>ch.p</literal> regular expression.</simpara>
</section>
<section xml:id="_header_route_predicate_factory">
<title>Header Route Predicate Factory</title>
<simpara>The Header Route Predicate Factory takes two parameters, the header name and a regular expression. This predicate matches with a header that has the given name and the value matches the regular expression.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: header_route
uri: http://example.org
predicates:
- Header=X-Request-Id, \d+</programlisting>
</para>
</formalpara>
<simpara>This route matches if the request has a header named <literal>X-Request-Id</literal> whos value matches the <literal>\d+</literal> regular expression (has a value of one or more digits).</simpara>
</section>
<section xml:id="_host_route_predicate_factory">
<title>Host Route Predicate Factory</title>
<simpara>The Host Route Predicate Factory takes one parameter: the host name pattern. The pattern is an Ant style pattern with <literal>.</literal> as the separator. This predicates matches the <literal>Host</literal> header that matches the pattern.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: host_route
uri: http://example.org
predicates:
- Host=**.somehost.org</programlisting>
</para>
</formalpara>
<simpara>This route would match if the request has a <literal>Host</literal> header has the value <literal>www.somehost.org</literal> or <literal>beta.somehost.org</literal>.</simpara>
</section>
<section xml:id="_method_route_predicate_factory">
<title>Method Route Predicate Factory</title>
<simpara>The Method Route Predicate Factory takes one parameter: the HTTP method to match.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: method_route
uri: http://example.org
predicates:
- Method=GET</programlisting>
</para>
</formalpara>
<simpara>This route would match if the request method was a <literal>GET</literal>.</simpara>
</section>
<section xml:id="_path_route_predicate_factory">
<title>Path Route Predicate Factory</title>
<simpara>The Path Route Predicate Factory takes one parameter: a Spring <literal>PathMatcher</literal> pattern.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: host_route
uri: http://example.org
predicates:
- Path=/foo/{segment}</programlisting>
</para>
</formalpara>
<simpara>This route would match if the request path was, for example: <literal>/foo/1</literal> or <literal>/foo/bar</literal>.</simpara>
<simpara>This predicate extracts the URI template variables (like <literal>segment</literal> defined in the example above) as a map of names and values and places it in the <literal>ServerWebExchange.getAttributes()</literal> with a key defined in <literal>PathRoutePredicate.URL_PREDICATE_VARS_ATTR</literal>. Those values are then available for use by <link linkend="gateway-route-filters">GatewayFilter Factories</link></simpara>
</section>
<section xml:id="_query_route_predicate_factory">
<title>Query Route Predicate Factory</title>
<simpara>The Query Route Predicate Factory takes two parameters: a required <literal>param</literal> and an optional <literal>regexp</literal>.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: query_route
uri: http://example.org
predicates:
- Query=baz</programlisting>
</para>
</formalpara>
<simpara>This route would match if the request contained a <literal>baz</literal> query parameter.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: query_route
uri: http://example.org
predicates:
- Query=foo, ba.</programlisting>
</para>
</formalpara>
<simpara>This route would match if the request contained a <literal>foo</literal> query parameter whose value matched the <literal>ba.</literal> regexp, so <literal>bar</literal> and <literal>baz</literal> would match.</simpara>
</section>
<section xml:id="_remoteaddr_route_predicate_factory">
<title>RemoteAddr Route Predicate Factory</title>
<simpara>The RemoteAddr Route Predicate Factory takes a list (min size 1) of CIDR-notation strings, e.g. <literal>192.168.0.1/16</literal> (where <literal>192.168.0.1</literal> is an IP address and <literal>16</literal> is a subnet mask.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: remoteaddr_route
uri: http://example.org
predicates:
- RemoteAddr=192.168.1.1/24</programlisting>
</para>
</formalpara>
<simpara>This route would match if the remote address of the request was, for example, <literal>192.168.1.10</literal>.</simpara>
</section>
</chapter>
<chapter xml:id="gateway-route-filters">
<title>GatewayFilter Factories</title>
<simpara>Route filters allow the modification of the incoming HTTP request or outgoing HTTP response in some manner. Route filters are scoped to a particular route. Spring Cloud Gateway includes many built-in GatewayFilter Factories.</simpara>
<section xml:id="_addrequestheader_gatewayfilter_factory">
<title>AddRequestHeader GatewayFilter Factory</title>
<simpara>The AddRequestHeader GatewayFilter Factory takes a name and value parameter.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: add_request_header_route
uri: http://example.org
filters:
- AddRequestHeader=X-Request-Foo, Bar</programlisting>
</para>
</formalpara>
<simpara>This will add <literal>X-Request-Foo:Bar</literal> header to the downstream request&#8217;s headers for all matching requests.</simpara>
</section>
<section xml:id="_addrequestparameter_gatewayfilter_factory">
<title>AddRequestParameter GatewayFilter Factory</title>
<simpara>The AddRequestParameter GatewayFilter Factory takes a name and value parameter.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: add_request_parameter_route
uri: http://example.org
filters:
- AddRequestParameter=foo, bar</programlisting>
</para>
</formalpara>
<simpara>This will add <literal>foo=bar</literal> to the downstream request&#8217;s query string for all matching requests.</simpara>
</section>
<section xml:id="_addresponseheader_gatewayfilter_factory">
<title>AddResponseHeader GatewayFilter Factory</title>
<simpara>The AddResponseHeader GatewayFilter Factory takes a name and value parameter.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: add_request_header_route
uri: http://example.org
filters:
- AddResponseHeader=X-Response-Foo, Bar</programlisting>
</para>
</formalpara>
<simpara>This will add <literal>X-Response-Foo:Bar</literal> header to the downstream response&#8217;s headers for all matching requests.</simpara>
</section>
<section xml:id="_hystrix_gatewayfilter_factory">
<title>Hystrix GatewayFilter Factory</title>
<simpara>The Hystrix GatewayFilter Factory takes a single <literal>name</literal> parameters, which is the name of the <literal>HystrixCommand</literal>. (More options might be added in future releases).</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: hytstrix_route
uri: http://example.org
filters:
- Hystrix=myCommandName</programlisting>
</para>
</formalpara>
<simpara>This wraps the remaining filters in a <literal>HystrixCommand</literal> with command name <literal>myCommandName</literal>.</simpara>
</section>
<section xml:id="_prefixpath_gatewayfilter_factory">
<title>PrefixPath GatewayFilter Factory</title>
<simpara>The PrefixPath GatewayFilter Factory takes a single <literal>prefix</literal> parameter.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: prefixpath_route
uri: http://example.org
filters:
- PrefixPath=/mypath</programlisting>
</para>
</formalpara>
<simpara>This will prefix <literal>/mypath</literal> to the path of all matching requests. So a request to <literal>/hello</literal>, would be sent to <literal>/mypath/hello</literal>.</simpara>
</section>
<section xml:id="_requestratelimiter_gatewayfilter_factory">
<title>RequestRateLimiter GatewayFilter Factory</title>
<simpara>The RequestRateLimiter GatewayFilter Factory takes three parameters: <literal>replenishRate</literal>, <literal>burstCapacity</literal> &amp; <literal>keyResolverName</literal>.</simpara>
<simpara><literal>replenishRate</literal> is how many requests per second do you want a user to be allowed to do.</simpara>
<simpara><literal>burstCapacity</literal> TODO: document burst capacity</simpara>
<simpara><literal>keyResolver</literal> is a bean that implements the <literal>KeyResolver</literal> interface. In configuration, reference the bean by name using SpEL. <literal>#{@myKeyResolver}</literal> is a SpEL expression referencing a bean with the name <literal>myKeyResolver</literal>.</simpara>
<formalpara>
<title>KeyResolver.java</title>
<para>
<programlisting language="java" linenumbering="unnumbered">public interface KeyResolver {
Mono&lt;String&gt; resolve(ServerWebExchange exchange);
}</programlisting>
</para>
</formalpara>
<simpara>The <literal>KeyResolver</literal> interface allows pluggable strategies to derive the key for limiting requests. In future milestones, there will be some <literal>KeyResolver</literal> implementations.</simpara>
<simpara>The redis implementation is based off of work done at <link xl:href="https://stripe.com/blog/rate-limiters">Stripe</link>. It requires the use of the <literal>spring-boot-starter-data-redis-reactive</literal> Spring Boot starter.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: requestratelimiter_route
uri: http://example.org
filters:
- RequestRateLimiter=10, 20, #{@userKeyResolver}</programlisting>
</para>
</formalpara>
<formalpara>
<title>Config.java</title>
<para>
<programlisting language="java" linenumbering="unnumbered">@Bean
KeyResolver userKeyResolver() {
return exchange -&gt; Mono.just(exchange.getRequest().getQueryParams().getFirst("user"));
}</programlisting>
</para>
</formalpara>
<simpara>This defines a request rate limit of 10 per user. The <literal>KeyResolver</literal> is a simple one that gets the <literal>user</literal> request parameter (note: this is not recommended for production).</simpara>
</section>
<section xml:id="_redirectto_gatewayfilter_factory">
<title>RedirectTo GatewayFilter Factory</title>
<simpara>The RedirectTo GatewayFilter Factory takes a <literal>status</literal> and a <literal>url</literal> parameter. The status should be a 300 series redirect http code, such as 301. The url should be a valid url. This will be the value of the <literal>Location</literal> header.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: prefixpath_route
uri: http://example.org
filters:
- RedirectTo=302, http://acme.org</programlisting>
</para>
</formalpara>
<simpara>This will send a status 302 with a <literal>Location:http://acme.org</literal> header to perform a redirect.</simpara>
</section>
<section xml:id="_removenonproxyheaders_gatewayfilter_factory">
<title>RemoveNonProxyHeaders GatewayFilter Factory</title>
<simpara>The RemoveNonProxyHeaders GatewayFilter Factory removes headers from forwarded requests. The default list of headers that is removed comes from the <link xl:href="https://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-14#section-7.1.3">IETF</link>.</simpara>
<itemizedlist>
<title>The default removed headers are:</title>
<listitem>
<simpara>Connection</simpara>
</listitem>
<listitem>
<simpara>Keep-Alive</simpara>
</listitem>
<listitem>
<simpara>Proxy-Authenticate</simpara>
</listitem>
<listitem>
<simpara>Proxy-Authorization</simpara>
</listitem>
<listitem>
<simpara>TE</simpara>
</listitem>
<listitem>
<simpara>Trailer</simpara>
</listitem>
<listitem>
<simpara>Transfer-Encoding</simpara>
</listitem>
<listitem>
<simpara>Upgrade</simpara>
</listitem>
</itemizedlist>
<simpara>To change this, set the <literal>spring.cloud.gateway.filter.remove-non-proxy-headers.headers</literal> property to the list of header names to remove.</simpara>
</section>
<section xml:id="_removerequestheader_gatewayfilter_factory">
<title>RemoveRequestHeader GatewayFilter Factory</title>
<simpara>The RemoveRequestHeader GatewayFilter Factory takes a <literal>name</literal> parameter. It is the name of the header to be removed.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: removerequestheader_route
uri: http://example.org
filters:
- RemoveRequestHeader=X-Request-Foo</programlisting>
</para>
</formalpara>
<simpara>This will remove the <literal>X-Request-Foo</literal> header before it is sent downstream.</simpara>
</section>
<section xml:id="_removeresponseheader_gatewayfilter_factory">
<title>RemoveResponseHeader GatewayFilter Factory</title>
<simpara>The RemoveResponseHeader GatewayFilter Factory takes a <literal>name</literal> parameter. It is the name of the header to be removed.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: removeresponseheader_route
uri: http://example.org
filters:
- RemoveResponseHeader=X-Response-Foo</programlisting>
</para>
</formalpara>
<simpara>This will remove the <literal>X-Response-Foo</literal> header from the response before it is returned to the gateway client.</simpara>
</section>
<section xml:id="_rewritepath_gatewayfilter_factory">
<title>RewritePath GatewayFilter Factory</title>
<simpara>The RewritePath GatewayFilter Factory takes a path <literal>regexp</literal> parameter and a <literal>replacement</literal> parameter. This uses Java regular expressions for a flexible way to rewrite the request path.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: rewritepath_route
uri: http://example.org
- Path=/foo/**
filters:
- RewritePath=/foo/(?&lt;segment&gt;.*), /$\{segment}</programlisting>
</para>
</formalpara>
<simpara>For a request path of <literal>/foo/bar</literal>, this will set the path to <literal>/bar</literal> before making the downstream request. Notice the <literal>$\</literal> which is replaced with <literal>$</literal> because of the YAML spec.</simpara>
</section>
<section xml:id="_secureheaders_gatewayfilter_factory">
<title>SecureHeaders GatewayFilter Factory</title>
<simpara>The SecureHeaders GatewayFilter Factory adds a number of headers to the response at the reccomendation from <link xl:href="https://blog.appcanary.com/2017/http-security-headers.html">this blog post</link>.</simpara>
<itemizedlist>
<title>The following headers are added (allong with default values):</title>
<listitem>
<simpara><literal>X-Xss-Protection:1; mode=block</literal></simpara>
</listitem>
<listitem>
<simpara><literal>Strict-Transport-Security:max-age=631138519</literal></simpara>
</listitem>
<listitem>
<simpara><literal>X-Frame-Options:DENY</literal></simpara>
</listitem>
<listitem>
<simpara><literal>X-Content-Type-Options:nosniff</literal></simpara>
</listitem>
<listitem>
<simpara><literal>Referrer-Policy:no-referrer</literal></simpara>
</listitem>
<listitem>
<simpara><literal>Content-Security-Policy:default-src 'self' https:; font-src 'self' https: data:; img-src 'self' https: data:; object-src 'none'; script-src https:; style-src 'self' https: 'unsafe-inline'</literal></simpara>
</listitem>
<listitem>
<simpara><literal>X-Download-Options:noopen</literal></simpara>
</listitem>
<listitem>
<simpara><literal>X-Permitted-Cross-Domain-Policies:none</literal></simpara>
</listitem>
</itemizedlist>
<simpara>To change the default values set the appropriate property in the <literal>spring.cloud.gateway.filter.secure-headers</literal> namespace:</simpara>
<itemizedlist>
<title>Property to change:</title>
<listitem>
<simpara><literal>xss-protection-header</literal></simpara>
</listitem>
<listitem>
<simpara><literal>strict-transport-security</literal></simpara>
</listitem>
<listitem>
<simpara><literal>frame-options</literal></simpara>
</listitem>
<listitem>
<simpara><literal>content-type-options</literal></simpara>
</listitem>
<listitem>
<simpara><literal>referrer-policy</literal></simpara>
</listitem>
<listitem>
<simpara><literal>content-security-policy</literal></simpara>
</listitem>
<listitem>
<simpara><literal>download-options</literal></simpara>
</listitem>
<listitem>
<simpara><literal>permitted-cross-domain-policies</literal></simpara>
</listitem>
</itemizedlist>
</section>
<section xml:id="_setpath_gatewayfilter_factory">
<title>SetPath GatewayFilter Factory</title>
<simpara>The SetPath GatewayFilter Factory takes a path <literal>template</literal> parameter. It offers a simple way to manipulate the request path by allowing templated segments of the path. This uses the uri templates from Spring Framework. Multiple matching segments are allowed.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: setpath_route
uri: http://example.org
predicates:
- Path=/foo/{segment}
filters:
- SetPath=/{segment}</programlisting>
</para>
</formalpara>
<simpara>For a request path of <literal>/foo/bar</literal>, this will set the path to <literal>/bar</literal> before making the downstream request.</simpara>
</section>
<section xml:id="_setresponseheader_gatewayfilter_factory">
<title>SetResponseHeader GatewayFilter Factory</title>
<simpara>The SetResponseHeader GatewayFilter Factory takes <literal>name</literal> and <literal>value</literal> parameters.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: setresponseheader_route
uri: http://example.org
filters:
- SetResponseHeader=X-Response-Foo, Bar</programlisting>
</para>
</formalpara>
<simpara>This GatewayFilter replaces all headers with the given name, rather than adding. So if the downstream server responded with a <literal>X-Response-Foo:1234</literal>, this would be replaced with <literal>X-Response-Foo:Bar</literal>, which is what the gateway client would receive.</simpara>
</section>
<section xml:id="_setstatus_gatewayfilter_factory">
<title>SetStatus GatewayFilter Factory</title>
<simpara>The SetStatus GatewayFilter Factory takes a single <literal>status</literal> parameter. It must be a valid Spring <literal>HttpStatus</literal>. It may be the integer value <literal>404</literal> or the string representation of the enumeration <literal>NOT_FOUND</literal>.</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: setstatusstring_route
uri: http://example.org
filters:
- SetStatus=BAD_REQUEST
- id: setstatusint_route
uri: http://example.org
filters:
- SetStatus=401</programlisting>
</para>
</formalpara>
<simpara>In either case, the HTTP status of the response will be set to 401.</simpara>
</section>
</chapter>
<chapter xml:id="_global_filters">
<title>Global Filters</title>
<simpara>The <literal>GlobalFilter</literal> interface has the same signature as <literal>GatewayFilter</literal>. These are special filters that are conditionally applied to all routes. (This interface and usage are subject to change in future milestones).</simpara>
<section xml:id="_combined_global_filter_and_gatewayfilter_ordering">
<title>Combined Global Filter and GatewayFilter Ordering</title>
<simpara>TODO: document ordering</simpara>
</section>
<section xml:id="_forward_routing_filter">
<title>Forward Routing Filter</title>
<simpara>The <literal>ForwardRoutingFilter</literal> looks for a URI in the exchange attribute <literal>ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR</literal>. If the url has a <literal>forward</literal> scheme (ie <literal>forward:///localendpoint</literal>), it will use the Spring <literal>DispatcherHandler</literal> to handler the request. The unmodified original url is appended to the list in the <literal>ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR</literal> attribute.</simpara>
</section>
<section xml:id="_loadbalancerclient_filter">
<title>LoadBalancerClient Filter</title>
<simpara>The <literal>LoadBalancerClientFilter</literal> looks for a URI in the exchange attribute <literal>ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR</literal>. If the url has a <literal>lb</literal> scheme (ie <literal>lb://myservice</literal>), it will use the Spring Cloud <literal>LoadBalancerClient</literal> to resolve the name (<literal>myservice</literal> in the previous example) to an actual host and port and replace the URI in the same attribute. The unmodified original url is appended to the list in the <literal>ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR</literal> attribute.</simpara>
</section>
<section xml:id="_netty_routing_filter">
<title>Netty Routing Filter</title>
<simpara>The Netty Routing Filter runs if the url located in the <literal>ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR</literal> exchange attribute has a <literal>http</literal> or <literal>https</literal> scheme. It uses the Netty <literal>HttpClient</literal> to make the downstream proxy request. The response is put in the <literal>ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR</literal> exchange attribute for use in a later filter. (There is an experimental <literal>WebClientHttpRoutingFilter</literal> that performs the same function, but does not require netty)</simpara>
</section>
<section xml:id="_netty_write_response_filter">
<title>Netty Write Response Filter</title>
<simpara>The <literal>NettyWriteResponseFilter</literal> runs if there is a Netty <literal>HttpClientResponse</literal> in the <literal>ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR</literal> exchange attribute. It is run after all other filters have completed and writes the proxy response back to the gateway client response. (There is an experimental <literal>WebClientWriteResponseFilter</literal> that performs the same function, but does not require netty)</simpara>
</section>
<section xml:id="_routetorequesturl_filter">
<title>RouteToRequestUrl Filter</title>
<simpara>The <literal>RouteToRequestUrlFilter</literal> runs if there is a <literal>Route</literal> object in the <literal>ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR</literal> exchange attribute. It creates a new URI, based off of the request URI, but updated with the URI attribute of the <literal>Route</literal> object. The new URI is placed in the <literal>`ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR</literal> exchange attribute`.</simpara>
</section>
<section xml:id="_websocket_routing_filter">
<title>Websocket Routing Filter</title>
<simpara>The Websocket Routing Filter runs if the url located in the <literal>ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR</literal> exchange attribute has a <literal>ws</literal> or <literal>wss</literal> scheme. It uses the Spring Web Socket infrastructure to forward the Websocket request downstream.</simpara>
</section>
</chapter>
<chapter xml:id="_configuration">
<title>Configuration</title>
<simpara>Configuration for Spring Cloud Gateway is driven by a collection of `RouteDefinitionLocator`s.</simpara>
<formalpara>
<title>RouteDefinitionLocator.java</title>
<para>
<programlisting language="java" linenumbering="unnumbered">public interface RouteDefinitionLocator {
Flux&lt;RouteDefinition&gt; getRouteDefinitions();
}</programlisting>
</para>
</formalpara>
<simpara>By default, a <literal>PropertiesRouteDefinitionLocator</literal> loads properties using Spring Boot&#8217;s <literal>@ConfigurationProperties</literal> mechanism.</simpara>
<simpara>The configuration examples above all use a shortcut notation that uses positional arguments rather than named ones. The two examples below are equivalent:</simpara>
<formalpara>
<title>application.yml</title>
<para>
<programlisting language="yaml" linenumbering="unnumbered">spring:
cloud:
gateway:
routes:
# =====================================
- id: setstatus_route
uri: http://example.org
filters:
- name: SetStatus
args:
status: 401
- id: setstatusshortcut_route
uri: http://example.org
filters:
- SetStatus=401</programlisting>
</para>
</formalpara>
<simpara>For some usages of the gateway, properties will be adequate, but some production use cases will benefit from loading configuration from an external source, such as a database. Future milestone versions will have <literal>RouteDefinitionLocator</literal> implementations based off of Spring Data Repositories such as: Redis, MongoDB and Cassandra.</simpara>
<section xml:id="_fluent_java_routes_api">
<title>Fluent Java Routes API</title>
<simpara>To allow for simple configuration in Java, there is a fluent API defined in the <literal>Routes</literal> class.</simpara>
<formalpara>
<title>GatewaySampleApplication.java</title>
<para>
<programlisting language="java" linenumbering="unnumbered">// static imports from GatewayFilters and RoutePredicates
@Bean
public RouteLocator customRouteLocator(ThrottleGatewayFilterFactory throttle) {
return Routes.locator()
.route("test")
.predicate(host("**.abc.org").and(path("/image/png")))
.addResponseHeader("X-TestHeader", "foobar")
.uri("http://httpbin.org:80")
.route("test2")
.predicate(path("/image/webp"))
.add(addResponseHeader("X-AnotherHeader", "baz"))
.uri("http://httpbin.org:80")
.route("test3")
.order(-1)
.predicate(host("**.throttle.org").and(path("/get")))
.add(throttle.apply(tuple().of("capacity", 1,
"refillTokens", 1,
"refillPeriod", 10,
"refillUnit", "SECONDS")))
.uri("http://httpbin.org:80")
.build();
}</programlisting>
</para>
</formalpara>
<simpara>This style also allows for more custom predicate assertions. The predicates defined by <literal>RouteDefinitionLocator</literal> beans are combined using logical <literal>and</literal>. By using the fluent Java API, you can use the <literal>and()</literal>, <literal>or()</literal> and <literal>negate()</literal> operators on the <literal>Predicate</literal> class.</simpara>
</section>
</chapter>
<chapter xml:id="_actuator_api">
<title>Actuator API</title>
<simpara>TODO: document the <literal>/gateway</literal> actuator endpoint</simpara>
</chapter>
<chapter xml:id="_developer_guide">
<title>Developer Guide</title>
<simpara>TODO: overview of writing custom integrations</simpara>
<section xml:id="_writing_custom_route_predicate_factories">
<title>Writing Custom Route Predicate Factories</title>
<simpara>TODO: document writing Custom Route Predicate Factories</simpara>
</section>
<section xml:id="_writing_custom_gatewayfilter_factories">
<title>Writing Custom GatewayFilter Factories</title>
<simpara>TODO: document writing Custom GatewayFilter Factories</simpara>
</section>
<section xml:id="_writing_custom_global_filters">
<title>Writing Custom Global Filters</title>
<simpara>TODO: document writing Custom Global Filters</simpara>
</section>
<section xml:id="_writing_custom_route_locators_and_writers">
<title>Writing Custom Route Locators and Writers</title>
<simpara>TODO: document writing Custom Route Locators and Writers</simpara>
</section>
</chapter>
<chapter xml:id="_building_a_simple_gateway_using_spring_mvc">
<title>Building a Simple Gateway Using Spring MVC</title>
<simpara>Spring Cloud Gateway provides a utility object called <literal>ProxyExchange</literal> which you can use inside a regular Spring MVC handler as a method parameter. It supports basic downstream HTTP exchanges via methods that mirror the HTTP verbs, or forwarding to a local handler via the <literal>forward()</literal> method.</simpara>
<simpara>Example (proxying a request to "/test" downstream to a remote server):</simpara>
<programlisting language="java" linenumbering="unnumbered">@RestController
@SpringBootApplication
public class GatewaySampleApplication {
@Value("${remote.home}")
private URI home;
@GetMapping("/test")
public ResponseEntity&lt;?&gt; proxy(ProxyExchange&lt;Object&gt; proxy) throws Exception {
return proxy.uri(home.toString() + "/image/png").get();
}
}</programlisting>
<simpara>There are convenience methods on the <literal>ProxyExchange</literal> to enable the handler method to discover and enhance the URI path of the incoming request. For example you might want to extract the trailing elements of a path to pass them downstream:</simpara>
<programlisting language="java" linenumbering="unnumbered">@GetMapping("/proxy/path/**")
public ResponseEntity&lt;?&gt; proxyPath(ProxyExchange&lt;?&gt; proxy) throws Exception {
String path = proxy.path("/proxy/path/");
return proxy.uri(home.toString() + "/foos/" + path).get();
}</programlisting>
<simpara>All the features of Spring MVC are available to Gateway handler methods. So you can inject request headers and query parameters, for instance, and you can constrain the incoming requests with declarations in the mapping annotation. See the documentation for <literal>@RequestMapping</literal> in Spring MVC for more details of those features.</simpara>
<simpara>Headers can be added to the downstream response using the <literal>header()</literal> methods on <literal>ProxyExchange</literal>.</simpara>
<simpara>You can also manipulate response headers (and anything else you like in the response) by adding a mapper to the <literal>get()</literal> etc. method. The mapper is a <literal>Function</literal> that takes the incoming <literal>ResponseEntity</literal> and converts it to an outgoing one.</simpara>
<simpara>First class support is provided for "sensitive" headers ("cookie" and "authorization" by default) which are not passed downstream, and for "proxy" headers (<literal>x-forwarded-*</literal>).</simpara>
</chapter>
</book>