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       <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 V1.79.1"><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 class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or built as a WAR.</p></td></tr></table></div></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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+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 class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>Spring Cloud Gateway is built upon <a class="link" href="https://spring.io/projects/spring-boot#learn" target="_top">Spring Boot 2.0</a>,
+<a class="link" href="https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html" target="_top">Spring WebFlux</a>,
+and <a class="link" href="https://projectreactor.io/docs" target="_top">Project Reactor</a>.  As a consequence
+many of the familiar synchronous libraries (Spring Data and Spring Security, for example) and patterns you may
+not apply when using Spring Cloud Gateway.  If you are unfamiliar with these projects we suggest you
+begin by reading their documentation to familiarize yourself with some of the new concepts before
+working with Spring Cloud Gateway.</p></td></tr></table></div><div class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or built as a WAR.</p></td></tr></table></div></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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diff --git a/single/spring-cloud-gateway.html b/single/spring-cloud-gateway.html
index a9a940fb..5b62a57b 100644
--- a/single/spring-cloud-gateway.html
+++ b/single/spring-cloud-gateway.html
@@ -2,7 +2,13 @@
       <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Spring Cloud Gateway</title><link rel="stylesheet" type="text/css" href="css/manual-singlepage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div lang="en" class="book"><div class="titlepage"><div><div><h1 class="title"><a name="d0e3"></a>Spring Cloud Gateway</h1></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="preface"><a href="#d0e9"></a></span></dt><dt><span class="chapter"><a href="#gateway-starter">1. How to Include Spring Cloud Gateway</a></span></dt><dt><span class="chapter"><a href="#_glossary">2. Glossary</a></span></dt><dt><span class="chapter"><a href="#gateway-how-it-works">3. How It Works</a></span></dt><dt><span class="chapter"><a href="#gateway-request-predicates-factories">4. Route Predicate Factories</a></span></dt><dd><dl><dt><span class="section"><a href="#_after_route_predicate_factory">4.1. After Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_before_route_predicate_factory">4.2. Before Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_between_route_predicate_factory">4.3. Between Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_cookie_route_predicate_factory">4.4. Cookie Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_header_route_predicate_factory">4.5. Header Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_host_route_predicate_factory">4.6. Host Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_method_route_predicate_factory">4.7. Method Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_path_route_predicate_factory">4.8. Path Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_query_route_predicate_factory">4.9. Query Route Predicate Factory</a></span></dt><dt><span class="section"><a href="#_remoteaddr_route_predicate_factory">4.10. RemoteAddr Route Predicate Factory</a></span></dt><dd><dl><dt><span class="section"><a href="#_modifying_the_way_remote_addresses_are_resolved">4.10.1. Modifying the way remote addresses are resolved</a></span></dt></dl></dd></dl></dd><dt><span class="chapter"><a href="#_gatewayfilter_factories">5. GatewayFilter Factories</a></span></dt><dd><dl><dt><span class="section"><a href="#_addrequestheader_gatewayfilter_factory">5.1. AddRequestHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_addrequestparameter_gatewayfilter_factory">5.2. AddRequestParameter GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_addresponseheader_gatewayfilter_factory">5.3. AddResponseHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#hystrix">5.4. Hystrix GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#fallback-headers">5.5. FallbackHeaders GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_prefixpath_gatewayfilter_factory">5.6. PrefixPath GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_preservehostheader_gatewayfilter_factory">5.7. PreserveHostHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_requestratelimiter_gatewayfilter_factory">5.8. RequestRateLimiter GatewayFilter Factory</a></span></dt><dd><dl><dt><span class="section"><a href="#_redis_ratelimiter">5.8.1. Redis RateLimiter</a></span></dt></dl></dd><dt><span class="section"><a href="#_redirectto_gatewayfilter_factory">5.9. RedirectTo GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_removehopbyhopheadersfilter_gatewayfilter_factory">5.10. RemoveHopByHopHeadersFilter GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_removerequestheader_gatewayfilter_factory">5.11. RemoveRequestHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_removeresponseheader_gatewayfilter_factory">5.12. RemoveResponseHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_rewritepath_gatewayfilter_factory">5.13. RewritePath GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_rewriteresponseheader_gatewayfilter_factory">5.14. RewriteResponseHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_savesession_gatewayfilter_factory">5.15. SaveSession GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_secureheaders_gatewayfilter_factory">5.16. SecureHeaders GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_setpath_gatewayfilter_factory">5.17. SetPath GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_setresponseheader_gatewayfilter_factory">5.18. SetResponseHeader GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_setstatus_gatewayfilter_factory">5.19. SetStatus GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_stripprefix_gatewayfilter_factory">5.20. StripPrefix GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_retry_gatewayfilter_factory">5.21. Retry GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_requestsize_gatewayfilter_factory">5.22. RequestSize GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_modify_request_body_gatewayfilter_factory">5.23. Modify Request Body GatewayFilter Factory</a></span></dt><dt><span class="section"><a href="#_modify_response_body_gatewayfilter_factory">5.24. Modify Response Body GatewayFilter Factory</a></span></dt></dl></dd><dt><span class="chapter"><a href="#_global_filters">6. Global Filters</a></span></dt><dd><dl><dt><span class="section"><a href="#_combined_global_filter_and_gatewayfilter_ordering">6.1. Combined Global Filter and GatewayFilter Ordering</a></span></dt><dt><span class="section"><a href="#_forward_routing_filter">6.2. Forward Routing Filter</a></span></dt><dt><span class="section"><a href="#_loadbalancerclient_filter">6.3. LoadBalancerClient Filter</a></span></dt><dt><span class="section"><a href="#_netty_routing_filter">6.4. Netty Routing Filter</a></span></dt><dt><span class="section"><a href="#_netty_write_response_filter">6.5. Netty Write Response Filter</a></span></dt><dt><span class="section"><a href="#_routetorequesturl_filter">6.6. RouteToRequestUrl Filter</a></span></dt><dt><span class="section"><a href="#_websocket_routing_filter">6.7. Websocket Routing Filter</a></span></dt><dt><span class="section"><a href="#_gateway_metrics_filter">6.8. Gateway Metrics Filter</a></span></dt><dt><span class="section"><a href="#_marking_an_exchange_as_routed">6.9. Marking An Exchange As Routed</a></span></dt></dl></dd><dt><span class="chapter"><a href="#_tls_ssl">7. TLS / SSL</a></span></dt><dd><dl><dt><span class="section"><a href="#_tls_handshake">7.1. TLS Handshake</a></span></dt></dl></dd><dt><span class="chapter"><a href="#_configuration">8. Configuration</a></span></dt><dd><dl><dt><span class="section"><a href="#_fluent_java_routes_api">8.1. Fluent Java Routes API</a></span></dt><dt><span class="section"><a href="#_discoveryclient_route_definition_locator">8.2. DiscoveryClient Route Definition Locator</a></span></dt><dd><dl><dt><span class="section"><a href="#_configuring_predicates_and_filters_for_discoveryclient_routes">8.2.1. Configuring Predicates and Filters For DiscoveryClient Routes</a></span></dt></dl></dd></dl></dd><dt><span class="chapter"><a href="#_reactor_netty_access_logs">9. Reactor Netty Access Logs</a></span></dt><dt><span class="chapter"><a href="#_cors_configuration">10. CORS Configuration</a></span></dt><dt><span class="chapter"><a href="#_actuator_api">11. Actuator API</a></span></dt><dd><dl><dt><span class="section"><a href="#_retrieving_route_filters">11.1. Retrieving route filters</a></span></dt><dd><dl><dt><span class="section"><a href="#_global_filters_2">11.1.1. Global Filters</a></span></dt><dt><span class="section"><a href="#_route_filters">11.1.2. Route Filters</a></span></dt></dl></dd><dt><span class="section"><a href="#_refreshing_the_route_cache">11.2. Refreshing the route cache</a></span></dt><dt><span class="section"><a href="#_retrieving_the_routes_defined_in_the_gateway">11.3. Retrieving the routes defined in the gateway</a></span></dt><dt><span class="section"><a href="#_retrieving_information_about_a_particular_route">11.4. Retrieving information about a particular route</a></span></dt><dt><span class="section"><a href="#_creating_and_deleting_a_particular_route">11.5. Creating and deleting a particular route</a></span></dt><dt><span class="section"><a href="#_recap_list_of_all_endpoints">11.6. Recap: list of all endpoints</a></span></dt></dl></dd><dt><span class="chapter"><a href="#_developer_guide">12. Developer Guide</a></span></dt><dd><dl><dt><span class="section"><a href="#_writing_custom_route_predicate_factories">12.1. Writing Custom Route Predicate Factories</a></span></dt><dt><span class="section"><a href="#_writing_custom_gatewayfilter_factories">12.2. Writing Custom GatewayFilter Factories</a></span></dt><dt><span class="section"><a href="#_writing_custom_global_filters">12.3. Writing Custom Global Filters</a></span></dt><dt><span class="section"><a href="#_writing_custom_route_locators_and_writers">12.4. Writing Custom Route Locators and Writers</a></span></dt></dl></dd><dt><span class="chapter"><a href="#_building_a_simple_gateway_using_spring_mvc_or_webflux">13. Building a Simple Gateway Using Spring MVC or Webflux</a></span></dt></dl></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>2.1.1.BUILD-SNAPSHOT</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="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 class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or built as a WAR.</p></td></tr></table></div></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="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/master/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 class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>URIs defined in routes without a port will get a default port set to 80 and 443 for HTTP and HTTPS URIs respectively.</p></td></tr></table></div></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>
+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 class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>Spring Cloud Gateway is built upon <a class="link" href="https://spring.io/projects/spring-boot#learn" target="_top">Spring Boot 2.0</a>,
+<a class="link" href="https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html" target="_top">Spring WebFlux</a>,
+and <a class="link" href="https://projectreactor.io/docs" target="_top">Project Reactor</a>.  As a consequence
+many of the familiar synchronous libraries (Spring Data and Spring Security, for example) and patterns you may
+not apply when using Spring Cloud Gateway.  If you are unfamiliar with these projects we suggest you
+begin by reading their documentation to familiarize yourself with some of the new concepts before
+working with Spring Cloud Gateway.</p></td></tr></table></div><div class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or built as a WAR.</p></td></tr></table></div></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="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/master/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 class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>URIs defined in routes without a port will get a default port set to 80 and 443 for HTTP and HTTPS URIs respectively.</p></td></tr></table></div></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>:
diff --git a/spring-cloud-gateway.xml b/spring-cloud-gateway.xml
index ae1aed71..fc5a6c40 100644
--- a/spring-cloud-gateway.xml
+++ b/spring-cloud-gateway.xml
@@ -18,6 +18,15 @@ and artifact id <literal>spring-cloud-starter-gateway</literal>. See the <link x
 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>
 <important>
+<simpara>Spring Cloud Gateway is built upon <link xl:href="https://spring.io/projects/spring-boot#learn">Spring Boot 2.0</link>,
+<link xl:href="https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html">Spring WebFlux</link>,
+and <link xl:href="https://projectreactor.io/docs">Project Reactor</link>.  As a consequence
+many of the familiar synchronous libraries (Spring Data and Spring Security, for example) and patterns you may
+not apply when using Spring Cloud Gateway.  If you are unfamiliar with these projects we suggest you
+begin by reading their documentation to familiarize yourself with some of the new concepts before
+working with Spring Cloud Gateway.</simpara>
+</important>
+<important>
 <simpara>Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or built as a WAR.</simpara>
 </important>
 </chapter>

	Important
	Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or built as a WAR.
	Note
	URIs defined in routes without a port will get a default port set to 80 and 443 for HTTP and HTTPS URIs respectively.