Polish "Align max HTTP header size configuration"

Closes gh-14234

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

@@ -29,6 +29,7 @@ import java.util.Map;
 import java.util.TimeZone;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.DeprecatedConfigurationProperty;
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
 import org.springframework.boot.convert.DurationUnit;
 import org.springframework.boot.web.server.Compression;
@@ -84,7 +85,7 @@ public class ServerProperties {
 	/**
 	 * Maximum size of the HTTP message header.
 	 */
-	private DataSize maxHttpHeaderSize = DataSize.ofKiloBytes(8L);
+	private DataSize maxHttpHeaderSize = DataSize.ofKiloBytes(8);
 
 	/**
 	 * Time that connectors wait for another HTTP request before closing the connection.
@@ -328,9 +329,7 @@ public class ServerProperties {
 
 		/**
 		 * Maximum size, in bytes, of the HTTP message header.
-		 * @deprecated since 2.1.0 in favor of {@link ServerProperties#maxHttpHeaderSize}
 		 */
-		@Deprecated
 		private int maxHttpHeaderSize = 0;
 
 		/**
@@ -496,10 +495,17 @@ public class ServerProperties {
 			this.maxConnections = maxConnections;
 		}
 
+		@Deprecated
+		@DeprecatedConfigurationProperty(replacement = "server.max-http-header-size")
 		public int getMaxHttpHeaderSize() {
 			return this.maxHttpHeaderSize;
 		}
 
+		@Deprecated
+		public void setMaxHttpHeaderSize(int maxHttpHeaderSize) {
+			this.maxHttpHeaderSize = maxHttpHeaderSize;
+		}
+
 		public DataSize getMaxSwallowSize() {
 			return this.maxSwallowSize;
 		}
@@ -508,10 +514,6 @@ public class ServerProperties {
 			this.maxSwallowSize = maxSwallowSize;
 		}
 
-		public void setMaxHttpHeaderSize(int maxHttpHeaderSize) {
-			this.maxHttpHeaderSize = maxHttpHeaderSize;
-		}
-
 		public int getAcceptCount() {
 			return this.acceptCount;
 		}

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

@@ -116,6 +116,7 @@ public class TomcatWebServerFactoryCustomizer implements
 		return value > 0;
 	}
 
+	@SuppressWarnings("deprecation")
 	private DataSize determineMaxHttpHeaderSize() {
 		return isPositive(this.serverProperties.getTomcat().getMaxHttpHeaderSize())
 				? DataSize

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

@@ -136,9 +136,16 @@ public class ServerPropertiesTests {
 
 	@Test
 	public void testCustomizeHeaderSize() {
-		bind("server.max-http-header-size", "9999");
+		bind("server.max-http-header-size", "1MB");
 		assertThat(this.properties.getMaxHttpHeaderSize())
-				.isEqualTo(DataSize.ofBytes(9999));
+				.isEqualTo(DataSize.ofMegaBytes(1));
+	}
+
+	@Test
+	public void testCustomizeHeaderSizeUseBytesByDefault() {
+		bind("server.max-http-header-size", "1024");
+		assertThat(this.properties.getMaxHttpHeaderSize())
+				.isEqualTo(DataSize.ofKiloBytes(1));
 	}
 
 	@Test

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

@@ -121,6 +121,24 @@ public class TomcatWebServerFactoryCustomizerTests {
 						.isEqualTo(10000));
 	}
 
+	@Test
+	public void customMaxHttpHeaderSize() {
+		bind("server.max-http-header-size=1KB");
+		customizeAndRunServer((server) -> assertThat(((AbstractHttp11Protocol<?>) server
+				.getTomcat().getConnector().getProtocolHandler()).getMaxHttpHeaderSize())
+						.isEqualTo(DataSize.ofKiloBytes(1).toBytes()));
+	}
+
+	@Test
+	@Deprecated
+	public void customMaxHttpHeaderSizeWithDeprecatedProperty() {
+		bind("server.max-http-header-size=4KB",
+				"server.tomcat.max-http-header-size=1024");
+		customizeAndRunServer((server) -> assertThat(((AbstractHttp11Protocol<?>) server
+				.getTomcat().getConnector().getProtocolHandler()).getMaxHttpHeaderSize())
+						.isEqualTo(DataSize.ofKiloBytes(1).toBytes()));
+	}
+
 	@Test
 	public void customMaxSwallowSize() {
 		bind("server.tomcat.max-swallow-size=10MB");

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -265,7 +265,6 @@ content into your application. Rather, pick only the properties that you need.
 			172\\.2[0-9]{1}\\.\\d{1,3}\\.\\d{1,3}|\\
 			172\\.3[0-1]{1}\\.\\d{1,3}\\.\\d{1,3} # Regular expression matching trusted IP addresses.
 	server.tomcat.max-connections=0 # Maximum number of connections that the server accepts and processes at any given time.
-	server.tomcat.max-http-header-size=0 # Maximum size, in bytes, of the HTTP message header. Deprecated, use server.max-http-header-size instead.
 	server.tomcat.max-http-post-size=0 # Maximum size, in bytes, of the HTTP post content.
 	server.tomcat.max-swallow-size=2MB # Maximum amount of request body to swallow.
 	server.tomcat.max-threads=0 # Maximum number of worker threads.