diff --git a/reactive/webflux/authentication/x509/build.gradle b/reactive/webflux/authentication/x509/build.gradle
new file mode 100644
index 0000000..46dc0e2
--- /dev/null
+++ b/reactive/webflux/authentication/x509/build.gradle
@@ -0,0 +1,20 @@
+plugins {
+	id 'org.springframework.boot' version '2.3.1.RELEASE'
+	id 'io.spring.dependency-management' version '1.0.9.RELEASE'
+	id "nebula.integtest" version "7.0.9"
+	id 'java'
+}
+
+repositories {
+	mavenCentral()
+	maven { url "https://repo.spring.io/snapshot" }
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-security'
+	implementation 'org.springframework.boot:spring-boot-starter-webflux'
+
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testImplementation 'org.springframework.security:spring-security-test'
+}
+
diff --git a/reactive/webflux/authentication/x509/gradle.properties b/reactive/webflux/authentication/x509/gradle.properties
new file mode 100644
index 0000000..7def6a0
--- /dev/null
+++ b/reactive/webflux/authentication/x509/gradle.properties
@@ -0,0 +1 @@
+spring-security.version=5.4.0.BUILD-SNAPSHOT
diff --git a/reactive/webflux/authentication/x509/gradle/wrapper/gradle-wrapper.jar b/reactive/webflux/authentication/x509/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..62d4c05
Binary files /dev/null and b/reactive/webflux/authentication/x509/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/reactive/webflux/authentication/x509/gradle/wrapper/gradle-wrapper.properties b/reactive/webflux/authentication/x509/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..622ab64
--- /dev/null
+++ b/reactive/webflux/authentication/x509/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/reactive/webflux/authentication/x509/gradlew b/reactive/webflux/authentication/x509/gradlew
new file mode 100755
index 0000000..fbd7c51
--- /dev/null
+++ b/reactive/webflux/authentication/x509/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/reactive/webflux/authentication/x509/gradlew.bat b/reactive/webflux/authentication/x509/gradlew.bat
new file mode 100644
index 0000000..a9f778a
--- /dev/null
+++ b/reactive/webflux/authentication/x509/gradlew.bat
@@ -0,0 +1,104 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/reactive/webflux/authentication/x509/settings.gradle b/reactive/webflux/authentication/x509/settings.gradle
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/reactive/webflux/authentication/x509/settings.gradle
@@ -0,0 +1 @@
+
diff --git a/reactive/webflux/authentication/x509/src/integTest/java/example/WebfluxX509ApplicationITest.java b/reactive/webflux/authentication/x509/src/integTest/java/example/WebfluxX509ApplicationITest.java
new file mode 100644
index 0000000..7b7318e
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/integTest/java/example/WebfluxX509ApplicationITest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import java.io.IOException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.UnrecoverableEntryException;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+
+import io.netty.handler.ssl.ClientAuth;
+import io.netty.handler.ssl.SslContextBuilder;
+import org.junit.jupiter.api.Test;
+import reactor.netty.http.client.HttpClient;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.http.client.reactive.ClientHttpConnector;
+import org.springframework.http.client.reactive.ReactorClientHttpConnector;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class WebfluxX509ApplicationITest {
+
+	@LocalServerPort
+	int port;
+
+	@Test
+	void shouldExtractAuthenticationFromCertificate() throws Exception {
+		WebTestClient webTestClient = createWebTestClientWithClientCertificate();
+		// @formatter:off
+		webTestClient.get()
+			.uri("/me")
+			.exchange()
+			.expectStatus().isOk()
+			.expectBody()
+			.consumeWith((result) -> {
+				String responseBody = new String(result.getResponseBody());
+				assertThat(responseBody).contains("Hello, client");
+			});
+		// @formatter:on
+	}
+
+	private WebTestClient createWebTestClientWithClientCertificate() throws KeyStoreException, IOException,
+			NoSuchAlgorithmException, CertificateException, UnrecoverableEntryException {
+		ClassPathResource serverKeystore = new ClassPathResource("/certs/server.p12");
+
+		KeyStore keyStore = KeyStore.getInstance("PKCS12");
+		keyStore.load(serverKeystore.getInputStream(), "password".toCharArray());
+
+		X509Certificate devCA = (X509Certificate) keyStore.getCertificate("DevCA");
+
+		X509Certificate clientCrt = (X509Certificate) keyStore.getCertificate("client");
+		KeyStore.Entry keyStoreEntry = keyStore.getEntry("client",
+				new KeyStore.PasswordProtection("password".toCharArray()));
+		PrivateKey clientKey = ((KeyStore.PrivateKeyEntry) keyStoreEntry).getPrivateKey();
+
+		// @formatter:off
+		SslContextBuilder sslContextBuilder = SslContextBuilder
+			.forClient().clientAuth(ClientAuth.REQUIRE)
+			.trustManager(devCA)
+			.keyManager(clientKey, clientCrt);
+		// @formatter:on
+
+		HttpClient httpClient = HttpClient.create()
+				.secure((sslContextSpec) -> sslContextSpec.sslContext(sslContextBuilder));
+		ClientHttpConnector httpConnector = new ReactorClientHttpConnector(httpClient);
+
+		// @formatter:off
+		return WebTestClient.bindToServer(httpConnector)
+			.baseUrl("https://localhost:" + this.port)
+			.build();
+		// @formatter:on
+	}
+
+}
diff --git a/reactive/webflux/authentication/x509/src/main/java/example/MeController.java b/reactive/webflux/authentication/x509/src/main/java/example/MeController.java
new file mode 100644
index 0000000..bc8168c
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/main/java/example/MeController.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import reactor.core.publisher.Mono;
+
+import org.springframework.security.core.context.ReactiveSecurityContextHolder;
+import org.springframework.security.core.context.SecurityContext;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * Says hello to the current user.
+ *
+ * @author Alexey Nesterov
+ * @since 5.2
+ */
+@RestController
+public class MeController {
+
+	@GetMapping("/me")
+	public Mono<String> me() {
+		return ReactiveSecurityContextHolder.getContext().map(SecurityContext::getAuthentication)
+				.map((authentication) -> "Hello, " + authentication.getName());
+	}
+
+}
diff --git a/reactive/webflux/authentication/x509/src/main/java/example/WebfluxX509Application.java b/reactive/webflux/authentication/x509/src/main/java/example/WebfluxX509Application.java
new file mode 100644
index 0000000..dced89b
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/main/java/example/WebfluxX509Application.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.security.config.web.server.ServerHttpSecurity;
+import org.springframework.security.core.userdetails.MapReactiveUserDetailsService;
+import org.springframework.security.core.userdetails.ReactiveUserDetailsService;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.web.server.SecurityWebFilterChain;
+
+import static org.springframework.security.config.Customizer.withDefaults;
+
+/**
+ * Webflux X509 application.
+ *
+ * @author Alexey Nesterov
+ * @since 5.2
+ */
+@SpringBootApplication
+public class WebfluxX509Application {
+
+	@Bean
+	public ReactiveUserDetailsService reactiveUserDetailsService() {
+		// @formatter:off
+		UserDetails client = User.withUsername("client")
+			.password("")
+			.roles("USER")
+			.build();
+		// @formatter:on
+		return new MapReactiveUserDetailsService(client);
+	}
+
+	@Bean
+	public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
+		// @formatter:off
+		http
+			.x509(withDefaults())
+			.authorizeExchange((exchanges) -> exchanges
+				.anyExchange().authenticated()
+			);
+		// @formatter:on
+
+		return http.build();
+	}
+
+	public static void main(String[] args) {
+		SpringApplication.run(WebfluxX509Application.class);
+	}
+
+}
diff --git a/reactive/webflux/authentication/x509/src/main/resources/application.yml b/reactive/webflux/authentication/x509/src/main/resources/application.yml
new file mode 100644
index 0000000..cdeb85f
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/main/resources/application.yml
@@ -0,0 +1,8 @@
+server:
+  port: 8443
+  ssl:
+    key-store: 'classpath:./certs/server.p12'
+    key-store-password: 'password'
+    client-auth: need
+    trust-store: 'classpath:./certs/server.p12'
+    trust-store-password: 'password'
diff --git a/reactive/webflux/authentication/x509/src/main/resources/certs/client.cer b/reactive/webflux/authentication/x509/src/main/resources/certs/client.cer
new file mode 100644
index 0000000..c9ddc65
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/main/resources/certs/client.cer
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/reactive/webflux/authentication/x509/src/main/resources/certs/client.keystore b/reactive/webflux/authentication/x509/src/main/resources/certs/client.keystore
new file mode 100644
index 0000000..e69de29
diff --git a/reactive/webflux/authentication/x509/src/main/resources/certs/client.pem b/reactive/webflux/authentication/x509/src/main/resources/certs/client.pem
new file mode 100644
index 0000000..abfcdba
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/main/resources/certs/client.pem
@@ -0,0 +1,32 @@
+Bag Attributes
+    friendlyName: user
+    localKeyID: 54 69 6D 65 20 31 35 39 35 38 37 38 39 37 32 38 39 35 
+Key Attributes: <No Attributes>
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
diff --git a/reactive/webflux/authentication/x509/src/main/resources/certs/curl_app.sh b/reactive/webflux/authentication/x509/src/main/resources/certs/curl_app.sh
new file mode 100644
index 0000000..dbf7af4
--- /dev/null
+++ b/reactive/webflux/authentication/x509/src/main/resources/certs/curl_app.sh
@@ -0,0 +1,2 @@
+ curl -vvvv --cacert out/DevCA.crt --cert out/localhost.crt --key out/localhost.key https://localhost:8443/me
+
diff --git a/reactive/webflux/authentication/x509/src/main/resources/certs/server.p12 b/reactive/webflux/authentication/x509/src/main/resources/certs/server.p12
new file mode 100644
index 0000000..8096cc7
Binary files /dev/null and b/reactive/webflux/authentication/x509/src/main/resources/certs/server.p12 differ
diff --git a/reactive/webflux/authentication/x509/src/main/resources/certs/tomcat.keystore b/reactive/webflux/authentication/x509/src/main/resources/certs/tomcat.keystore
new file mode 100644
index 0000000..e69de29
diff --git a/settings.gradle b/settings.gradle
index 715885e..daaeee6 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -19,6 +19,7 @@ include ":reactive:webflux:hello-security-explicit"
 include ":reactive:webflux:method"
 include ":reactive:webflux:hello-security"
 include ":reactive:webflux:authentication:username-password:form"
+include ":reactive:webflux:authentication:x509"
 include ":servlet:spring-boot:java:hello"
 include ":servlet:spring-boot:java:hello-security-explicit"
 include ":servlet:spring-boot:java:hello-security"