Add configuration properties for configuring Tomcat's keepAliveTimeout

 and maxKeepAliveRequests
 See #25805

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

@@ -66,6 +66,7 @@
  * @author HaiTao Zhang
  * @author Victor Mandujano
  * @author Chris Bono
+ * @author Parviz Rozikov
  * @since 1.0.0
  */
 @ConfigurationProperties(prefix = "server", ignoreUnknownFields = true)
@@ -370,6 +371,22 @@ public static class Tomcat {
 		 */
 		private int processorCache = 200;
 
+		/**
+		 * The number of milliseconds this Connector will wait for another HTTP request
+		 * before closing the connection. The default value is to use the value that has
+		 * been set for the connectionTimeout attribute. Use a value of -1 to indicate no
+		 * (i.e. infinite) timeout.
+		 */
+		private Duration keepAliveTimeout;
+
+		/**
+		 * The maximum number of HTTP requests which can be pipelined until the connection
+		 * is closed by the server./ Setting this attribute to 1 will disable HTTP/1.0
+		 * keep-alive as well as HTTP/1.1 keep-alive and pipelining. Setting this to -1
+		 * will allow an unlimited amount of pipelined or keep-alive HTTP requests.
+		 */
+		private int maxKeepAliveRequests = 100;
+
 		/**
 		 * Comma-separated list of additional patterns that match jars to ignore for TLD
 		 * scanning. The special '?' and '*' characters can be used in the pattern to
@@ -498,6 +515,22 @@ public void setProcessorCache(int processorCache) {
 			this.processorCache = processorCache;
 		}
 
+		public Duration getKeepAliveTimeout() {
+			return this.keepAliveTimeout;
+		}
+
+		public void setKeepAliveTimeout(Duration keepAliveTimeout) {
+			this.keepAliveTimeout = keepAliveTimeout;
+		}
+
+		public int getMaxKeepAliveRequests() {
+			return this.maxKeepAliveRequests;
+		}
+
+		public void setMaxKeepAliveRequests(int maxKeepAliveRequests) {
+			this.maxKeepAliveRequests = maxKeepAliveRequests;
+		}
+
 		public List<String> getAdditionalTldSkipPatterns() {
 			return this.additionalTldSkipPatterns;
 		}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/embedded/TomcatWebServerFactoryCustomizer.java

@@ -56,6 +56,7 @@
  * @author Dirk Deyne
  * @author Rafiullah Hamedy
  * @author Victor Mandujano
+ * @author Parviz Rozikov
  * @since 2.0.0
  */
 public class TomcatWebServerFactoryCustomizer
@@ -108,6 +109,10 @@ public void customize(ConfigurableTomcatWebServerFactory factory) {
 				.to((acceptCount) -> customizeAcceptCount(factory, acceptCount));
 		propertyMapper.from(tomcatProperties::getProcessorCache)
 				.to((processorCache) -> customizeProcessorCache(factory, processorCache));
+		propertyMapper.from(tomcatProperties::getKeepAliveTimeout).whenNonNull()
+				.to((keepAliveTimeout) -> customizeKeepAliveTimeout(factory, keepAliveTimeout));
+		propertyMapper.from(tomcatProperties::getMaxKeepAliveRequests)
+				.to((maxKeepAliveRequests) -> customizeMaxKeepAliveRequests(factory, maxKeepAliveRequests));
 		propertyMapper.from(tomcatProperties::getRelaxedPathChars).as(this::joinCharacters).whenHasText()
 				.to((relaxedChars) -> customizeRelaxedPathChars(factory, relaxedChars));
 		propertyMapper.from(tomcatProperties::getRelaxedQueryChars).as(this::joinCharacters).whenHasText()
@@ -139,6 +144,26 @@ private void customizeProcessorCache(ConfigurableTomcatWebServerFactory factory,
 		});
 	}
 
+	private void customizeKeepAliveTimeout(ConfigurableTomcatWebServerFactory factory, Duration keepAliveTimeout) {
+		factory.addConnectorCustomizers((connector) -> {
+			ProtocolHandler handler = connector.getProtocolHandler();
+			if (handler instanceof AbstractProtocol) {
+				final AbstractProtocol<?> protocol = (AbstractProtocol<?>) handler;
+				protocol.setKeepAliveTimeout((int) keepAliveTimeout.toMillis());
+			}
+		});
+	}
+
+	private void customizeMaxKeepAliveRequests(ConfigurableTomcatWebServerFactory factory, int maxKeepAliveRequests) {
+		factory.addConnectorCustomizers((connector) -> {
+			ProtocolHandler handler = connector.getProtocolHandler();
+			if (handler instanceof AbstractHttp11Protocol) {
+				AbstractHttp11Protocol<?> protocol = (AbstractHttp11Protocol<?>) handler;
+				protocol.setMaxKeepAliveRequests(maxKeepAliveRequests);
+			}
+		});
+	}
+
 	private void customizeMaxConnections(ConfigurableTomcatWebServerFactory factory, int maxConnections) {
 		factory.addConnectorCustomizers((connector) -> {
 			ProtocolHandler handler = connector.getProtocolHandler();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java

@@ -38,6 +38,7 @@
 import org.apache.catalina.valves.AccessLogValve;
 import org.apache.catalina.valves.RemoteIpValve;
 import org.apache.coyote.AbstractProtocol;
+import org.apache.tomcat.util.net.AbstractEndpoint;
 import org.eclipse.jetty.server.HttpChannel;
 import org.eclipse.jetty.server.Request;
 import org.eclipse.jetty.server.Server;
@@ -82,6 +83,7 @@
  * @author HaiTao Zhang
  * @author Rafiullah Hamedy
  * @author Chris Bono
+ * @author Parviz Rozikov
  */
 class ServerPropertiesTests {
 
@@ -216,6 +218,25 @@ void testCustomizeTomcatMaxThreads() {
 		assertThat(this.properties.getTomcat().getThreads().getMax()).isEqualTo(10);
 	}
 
+	@Test
+	void testCustomizeTomcatKeepAliveTimeout() {
+		bind("server.tomcat.keep-alive-timeout", "30s");
+		assertThat(this.properties.getTomcat().getKeepAliveTimeout()).hasSeconds(30);
+	}
+
+	@Test
+	void testCustomizeTomcatKeepAliveTimeoutWithInfinite() {
+		bind("server.tomcat.keep-alive-timeout", "-1");
+		assertThat(this.properties.getTomcat().getKeepAliveTimeout().toMillis()).isEqualTo(-1);
+		assertThat(this.properties.getTomcat().getKeepAliveTimeout()).hasMillis(-1);
+	}
+
+	@Test
+	void customizeMaxKeepAliveRequests() {
+		bind("server.tomcat.max-keep-alive-requests", "-1");
+		assertThat(this.properties.getTomcat().getMaxKeepAliveRequests()).isEqualTo(-1);
+	}
+
 	@Test
 	void testCustomizeTomcatMinSpareThreads() {
 		bind("server.tomcat.threads.min-spare", "10");
@@ -384,6 +405,14 @@ void tomcatUseRelativeRedirectsDefaultsToFalse() {
 		assertThat(this.properties.getTomcat().isUseRelativeRedirects()).isFalse();
 	}
 
+	@Test
+	void tomcatMaxKeepAliveRequestsDefault() throws Exception {
+		AbstractEndpoint<?, ?> endpoint = (AbstractEndpoint<?, ?>) ReflectionTestUtils.getField(getDefaultProtocol(),
+				"endpoint");
+		int defaultMaxKeepAliveRequests = (int) ReflectionTestUtils.getField(endpoint, "maxKeepAliveRequests");
+		assertThat(this.properties.getTomcat().getMaxKeepAliveRequests()).isEqualTo(defaultMaxKeepAliveRequests);
+	}
+
 	@Test
 	void jettyThreadPoolPropertyDefaultsShouldMatchServerDefault() {
 		JettyServletWebServerFactory jettyFactory = new JettyServletWebServerFactory(0);

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/TomcatWebServerFactoryCustomizerTests.java

@@ -56,6 +56,7 @@
  * @author Andrew McGhie
  * @author Rafiullah Hamedy
  * @author Victor Mandujano
+ * @author Parviz Rozikov
  */
 class TomcatWebServerFactoryCustomizerTests {
 
@@ -97,6 +98,29 @@ void customProcessorCache() {
 						.isEqualTo(100));
 	}
 
+	@Test
+	void customizeKeepAliveTimeout() {
+		bind("server.tomcat.keep-alive-timeout=30ms");
+		customizeAndRunServer((server) -> assertThat(
+				((AbstractProtocol<?>) server.getTomcat().getConnector().getProtocolHandler()).getKeepAliveTimeout())
+						.isEqualTo(30));
+	}
+
+	@Test
+	void customizeMaxKeepAliveRequests() {
+		bind("server.tomcat.max-keep-alive-requests=-1");
+		customizeAndRunServer((server) -> assertThat(
+				((AbstractHttp11Protocol<?>) server.getTomcat().getConnector().getProtocolHandler())
+						.getMaxKeepAliveRequests()).isEqualTo(-1));
+	}
+
+	@Test
+	void defaultMaxKeepAliveRequests() {
+		customizeAndRunServer((server) -> assertThat(
+				((AbstractHttp11Protocol<?>) server.getTomcat().getConnector().getProtocolHandler())
+						.getMaxKeepAliveRequests()).isEqualTo(100));
+	}
+
 	@Test
 	void unlimitedProcessorCache() {
 		bind("server.tomcat.processor-cache=-1");