Polish

See gh-24238

spring-web/src/main/java/org/springframework/http/HttpHeaders.java

@@ -1522,6 +1522,22 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
 		return Collections.emptyList();
 	}
 
+	/**
+	 * Remove the well-known {@code "Content-*"} HTTP headers.
+	 * <p>Such headers should be cleared from the response if the intended
+	 * body can't be written due to errors.
+	 * @since 5.2.3
+	 */
+	public void clearContentHeaders() {
+		this.headers.remove(HttpHeaders.CONTENT_DISPOSITION);
+		this.headers.remove(HttpHeaders.CONTENT_ENCODING);
+		this.headers.remove(HttpHeaders.CONTENT_LANGUAGE);
+		this.headers.remove(HttpHeaders.CONTENT_LENGTH);
+		this.headers.remove(HttpHeaders.CONTENT_LOCATION);
+		this.headers.remove(HttpHeaders.CONTENT_RANGE);
+		this.headers.remove(HttpHeaders.CONTENT_TYPE);
+	}
+
 	/**
 	 * Retrieve a combined result from the field values of the ETag header.
 	 * @param headerName the header name
@@ -1827,22 +1843,6 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
 		return new String(encodedBytes, charset);
 	}
 
-	/**
-	 * Remove the well-known {@code "Content-*"} HTTP headers from the given instance.
-	 * <p>Such headers should be cleared, if possible, from the response if the intended
-	 * body can't be written due to errors.
-	 * @since 5.2.3
-	 */
-	public static void clearContentHeaders(HttpHeaders headers) {
-		headers.remove(HttpHeaders.CONTENT_DISPOSITION);
-		headers.remove(HttpHeaders.CONTENT_ENCODING);
-		headers.remove(HttpHeaders.CONTENT_LANGUAGE);
-		headers.remove(HttpHeaders.CONTENT_LENGTH);
-		headers.remove(HttpHeaders.CONTENT_LOCATION);
-		headers.remove(HttpHeaders.CONTENT_RANGE);
-		headers.remove(HttpHeaders.CONTENT_TYPE);
-	}
-
 	// Package-private: used in ResponseCookie
 	static String formatDate(long date) {
 		Instant instant = Instant.ofEpochMilli(date);

spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java

@@ -75,6 +75,11 @@ class ReadOnlyHttpHeaders extends HttpHeaders {
 		}
 	}
 
+	@Override
+	public void clearContentHeaders() {
+		// No-op.
+	}
+
 	@Override
 	public List<String> get(Object key) {
 		List<String> values = this.headers.get(key);

spring-web/src/main/java/org/springframework/http/server/reactive/AbstractServerHttpResponse.java

@@ -182,22 +182,16 @@ public abstract class AbstractServerHttpResponse implements ServerHttpResponse {
 			return ((Mono<? extends DataBuffer>) body).flatMap(buffer ->
 					doCommit(() -> writeWithInternal(Mono.just(buffer)))
 							.doOnDiscard(PooledDataBuffer.class, DataBufferUtils::release))
-					.doOnError(t -> clearContentHeaders());
+					.doOnError(t -> this.getHeaders().clearContentHeaders());
 		}
 		return new ChannelSendOperator<>(body, inner -> doCommit(() -> writeWithInternal(inner)))
-				.doOnError(t -> clearContentHeaders());
+				.doOnError(t -> this.getHeaders().clearContentHeaders());
 	}
 
 	@Override
 	public final Mono<Void> writeAndFlushWith(Publisher<? extends Publisher<? extends DataBuffer>> body) {
 		return new ChannelSendOperator<>(body, inner -> doCommit(() -> writeAndFlushWithInternal(inner)))
-				.doOnError(t -> clearContentHeaders());
-	}
-
-	private void clearContentHeaders() {
-		if (!this.isCommitted()) {
-			HttpHeaders.clearContentHeaders(this.getHeaders());
-		}
+				.doOnError(t -> this.getHeaders().clearContentHeaders());
 	}
 
 	@Override

spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/RequestMappingHandlerAdapter.java

@@ -29,7 +29,6 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.core.ReactiveAdapterRegistry;
-import org.springframework.http.HttpHeaders;
 import org.springframework.http.codec.HttpMessageReader;
 import org.springframework.http.codec.ServerCodecConfigurer;
 import org.springframework.lang.Nullable;
@@ -210,9 +209,7 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, Application
 
 		// Success and error responses may use different content types
 		exchange.getAttributes().remove(HandlerMapping.PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE);
-		if (!exchange.getResponse().isCommitted()) {
-			HttpHeaders.clearContentHeaders(exchange.getResponse().getHeaders());
-		}
+		exchange.getResponse().getHeaders().clearContentHeaders();
 
 		InvocableHandlerMethod invocable = this.methodResolver.getExceptionHandlerMethod(exception, handlerMethod);
 		if (invocable != null) {