diff --git a/reactor-netty5-http/src/main/java/reactor/netty5/http/server/HttpServerOperations.java b/reactor-netty5-http/src/main/java/reactor/netty5/http/server/HttpServerOperations.java
index 8c6907cb8f..7c030039aa 100644
--- a/reactor-netty5-http/src/main/java/reactor/netty5/http/server/HttpServerOperations.java
+++ b/reactor-netty5-http/src/main/java/reactor/netty5/http/server/HttpServerOperations.java
@@ -36,7 +36,6 @@
 import io.netty5.channel.ChannelFutureListeners;
 import io.netty5.channel.ChannelHandlerContext;
 import io.netty5.channel.ChannelOption;
-import io.netty5.handler.codec.TooLongFrameException;
 import io.netty5.handler.codec.http.DefaultFullHttpResponse;
 import io.netty5.handler.codec.http.DefaultHttpResponse;
 import io.netty5.handler.codec.http.DefaultLastHttpContent;
@@ -58,6 +57,8 @@
 import io.netty5.handler.codec.http.HttpUtil;
 import io.netty5.handler.codec.http.HttpVersion;
 import io.netty5.handler.codec.http.LastHttpContent;
+import io.netty5.handler.codec.http.TooLongHttpHeaderException;
+import io.netty5.handler.codec.http.TooLongHttpLineException;
 import io.netty5.handler.codec.http.headers.HttpSetCookie;
 import io.netty5.handler.codec.http.websocketx.CloseWebSocketFrame;
 import io.netty5.handler.codec.http.websocketx.WebSocketCloseStatus;
@@ -723,9 +724,17 @@ static void sendDecodingFailures(
 
 		Resource.dispose(msg);
 
-		HttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,
-				cause instanceof TooLongFrameException ? HttpResponseStatus.REQUEST_ENTITY_TOO_LARGE :
-				                                         HttpResponseStatus.BAD_REQUEST,
+		final HttpResponseStatus status;
+		if (cause instanceof TooLongHttpLineException) {
+			status = HttpResponseStatus.REQUEST_URI_TOO_LONG;
+		}
+		else if (cause instanceof TooLongHttpHeaderException) {
+			status = HttpResponseStatus.REQUEST_HEADER_FIELDS_TOO_LARGE;
+		}
+		else {
+			status = HttpResponseStatus.BAD_REQUEST;
+		}
+		HttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, status,
 				ctx.bufferAllocator().allocate(0));
 		response.headers()
 		        .set(HttpHeaderNames.CONTENT_LENGTH, HttpHeaderValues.ZERO)
diff --git a/reactor-netty5-http/src/test/java/reactor/netty5/http/HttpMetricsHandlerTests.java b/reactor-netty5-http/src/test/java/reactor/netty5/http/HttpMetricsHandlerTests.java
index fe967fd461..bad41a2db4 100644
--- a/reactor-netty5-http/src/test/java/reactor/netty5/http/HttpMetricsHandlerTests.java
+++ b/reactor-netty5-http/src/test/java/reactor/netty5/http/HttpMetricsHandlerTests.java
@@ -764,7 +764,7 @@ void testBadRequest(HttpProtocol[] serverProtocols, HttpProtocol[] clientProtoco
 		          .uri("/max_header_size")
 		          .responseSingle((res, bufferMono) -> Mono.just(res.status().code()))
 		          .as(StepVerifier::create)
-		          .expectNext(413)
+		          .expectNext(431)
 		          .expectComplete()
 		          .verify(Duration.ofSeconds(30));
 
@@ -879,7 +879,7 @@ private void checkExpectationsNonExisting(String serverAddress, int connIndex, i
 
 	private void checkExpectationsBadRequest(String serverAddress, boolean checkTls) {
 		String uri = "/max_header_size";
-		String[] timerTags1 = new String[] {URI, uri, METHOD, "GET", STATUS, "413"};
+		String[] timerTags1 = new String[] {URI, uri, METHOD, "GET", STATUS, "431"};
 		String[] summaryTags1 = new String[] {URI, uri};
 
 		checkTimer(SERVER_RESPONSE_TIME, timerTags1, 1);
@@ -887,7 +887,7 @@ private void checkExpectationsBadRequest(String serverAddress, boolean checkTls)
 		checkDistributionSummary(SERVER_DATA_SENT, summaryTags1, 1, 0);
 		checkCounter(SERVER_ERRORS, summaryTags1, false, 0);
 
-		timerTags1 = new String[] {REMOTE_ADDRESS, serverAddress, URI, uri, METHOD, "GET", STATUS, "413"};
+		timerTags1 = new String[] {REMOTE_ADDRESS, serverAddress, URI, uri, METHOD, "GET", STATUS, "431"};
 		String[] timerTags2 = new String[] {REMOTE_ADDRESS, serverAddress, URI, uri, METHOD, "GET"};
 		String[] timerTags3 = new String[] {REMOTE_ADDRESS, serverAddress, STATUS, "SUCCESS"};
 		summaryTags1 = new String[] {REMOTE_ADDRESS, serverAddress, URI, uri};
diff --git a/reactor-netty5-http/src/test/java/reactor/netty5/http/server/HttpServerTests.java b/reactor-netty5-http/src/test/java/reactor/netty5/http/server/HttpServerTests.java
index 4d65c14de0..ffa1bf8e2c 100644
--- a/reactor-netty5-http/src/test/java/reactor/netty5/http/server/HttpServerTests.java
+++ b/reactor-netty5-http/src/test/java/reactor/netty5/http/server/HttpServerTests.java
@@ -909,7 +909,29 @@ private void doTestIssue309(String path, HttpServer httpServer) {
 				          .responseSingle((res, bufferMono) -> Mono.just(res.status()));
 
 		StepVerifier.create(status)
-		            .expectNextMatches(HttpResponseStatus.REQUEST_ENTITY_TOO_LARGE::equals)
+		            .expectNextMatches(HttpResponseStatus.REQUEST_URI_TOO_LONG::equals)
+		            .expectComplete()
+		            .verify();
+	}
+
+	@Test
+	void httpServerRequestHeadersTooLong() {
+		HttpServer httpServer = HttpServer.create()
+				          .port(0)
+				          .httpRequestDecoder(c -> c.maxHeaderSize(20));
+		disposableServer =
+				httpServer.handle((req, res) -> res.sendString(Mono.just("Should not be reached")))
+				          .bindNow();
+
+		Mono<HttpResponseStatus> status =
+				createClient(disposableServer.port())
+				          .headers(h -> h.set("content-type", "somethingtooolooong"))
+				          .get()
+				          .uri("/path")
+				          .responseSingle((res, byteBufMono) -> Mono.just(res.status()));
+
+		StepVerifier.create(status)
+		            .expectNextMatches(HttpResponseStatus.REQUEST_HEADER_FIELDS_TOO_LARGE::equals)
 		            .expectComplete()
 		            .verify();
 	}