Polishing in HttpServiceMethod

framework-docs/modules/ROOT/pages/web/webflux/controller/ann-requestmapping.adoc

@@ -605,9 +605,4 @@ For method parameters and returns values, generally, `@HttpExchange` supports a
 subset of the method parameters that `@RequestMapping` does. Notably, it excludes any
 server-side specific parameter types. For details, see the list for
 xref:integration/rest-clients.adoc#rest-http-interface-method-parameters[@HttpExchange] and
-xref:web/webflux/controller/ann-methods/arguments.adoc[@RequestMapping].
+xref:web/webflux/controller/ann-methods/arguments.adoc[@RequestMapping].
-
-`@HttpExchange` also supports a `headers()` parameter which accepts `"name=value"`-like
-pairs like in `@RequestMapping(headers={})` on the client side. On the server side,
-this extends to the full syntax that
-xref:#webflux-ann-requestmapping-params-and-headers[`@RequestMapping`] supports.

spring-web/src/main/java/org/springframework/web/service/invoker/HttpServiceMethod.java

@@ -22,7 +22,6 @@ import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
-import java.util.Set;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
@@ -160,7 +159,7 @@ final class HttpServiceMethod {
 	private record HttpRequestValuesInitializer(
 			@Nullable HttpMethod httpMethod, @Nullable String url,
 			@Nullable MediaType contentType, @Nullable List<MediaType> acceptMediaTypes,
-			@Nullable MultiValueMap<String, String> otherHeaders,
+			MultiValueMap<String, String> headers,
 			Supplier<HttpRequestValues.Builder> requestValuesSupplier) {
 
 		public HttpRequestValues.Builder initializeRequestValuesBuilder() {
@@ -177,16 +176,8 @@ final class HttpServiceMethod {
 			if (this.acceptMediaTypes != null) {
 				requestValues.setAccept(this.acceptMediaTypes);
 			}
-			if (this.otherHeaders != null) {
+			this.headers.forEach((name, values) ->
-				this.otherHeaders.forEach((name, values) -> {
+					values.forEach(value -> requestValues.addHeader(name, value)));
-					if (values.size() == 1) {
-						requestValues.addHeader(name, values.get(0));
-					}
-					else {
-						requestValues.addHeader(name, values.toArray(new String[0]));
-					}
-				});
-			}
 			return requestValues;
 		}
 
@@ -217,10 +208,10 @@ final class HttpServiceMethod {
 			String url = initUrl(typeAnnotation, methodAnnotation, embeddedValueResolver);
 			MediaType contentType = initContentType(typeAnnotation, methodAnnotation);
 			List<MediaType> acceptableMediaTypes = initAccept(typeAnnotation, methodAnnotation);
-			MultiValueMap<String, String> headers = initHeaders(typeAnnotation, methodAnnotation,
+			MultiValueMap<String, String> headers = initHeaders(typeAnnotation, methodAnnotation, embeddedValueResolver);
-					embeddedValueResolver);
+
-			return new HttpRequestValuesInitializer(httpMethod, url, contentType,
+			return new HttpRequestValuesInitializer(
-					acceptableMediaTypes, headers, requestValuesSupplier);
+					httpMethod, url, contentType, acceptableMediaTypes, headers, requestValuesSupplier);
 		}
 
 		@Nullable
@@ -296,48 +287,42 @@ final class HttpServiceMethod {
 			return null;
 		}
 
-		private static MultiValueMap<String, String> parseHeaders(String[] headersArray,
+		private static MultiValueMap<String, String> initHeaders(
+				@Nullable HttpExchange typeAnnotation, HttpExchange methodAnnotation,
 				@Nullable StringValueResolver embeddedValueResolver) {
+
 			MultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
-			for (String h: headersArray) {
+			if (typeAnnotation != null) {
-				String[] headerPair = StringUtils.split(h, "=");
+				addHeaders(typeAnnotation.headers(), embeddedValueResolver, headers);
-				if (headerPair != null) {
-					String headerName = headerPair[0].trim();
-					List<String> headerValues = new ArrayList<>();
-					Set<String> parsedValues = StringUtils.commaDelimitedListToSet(headerPair[1]);
-					for (String headerValue : parsedValues) {
-						if (embeddedValueResolver != null) {
-							headerValue = embeddedValueResolver.resolveStringValue(headerValue);
-						}
-						if (headerValue != null) {
-							headerValue = headerValue.trim();
-							headerValues.add(headerValue);
-						}
-					}
-					if (!headerValues.isEmpty()) {
-						headers.addAll(headerName, headerValues);
-					}
-				}
 			}
+			addHeaders(methodAnnotation.headers(), embeddedValueResolver, headers);
 			return headers;
 		}
 
-		@Nullable
+		private static void addHeaders(
-		private static MultiValueMap<String, String> initHeaders(@Nullable HttpExchange typeAnnotation, HttpExchange methodAnnotation,
+				String[] rawValues, @Nullable StringValueResolver embeddedValueResolver,
-				@Nullable StringValueResolver embeddedValueResolver) {
+				MultiValueMap<String, String> outputHeaders) {
-			MultiValueMap<String, String> methodLevelHeaders = parseHeaders(methodAnnotation.headers(),
-					embeddedValueResolver);
-			if (!ObjectUtils.isEmpty(methodLevelHeaders)) {
-				return methodLevelHeaders;
-			}
 
-			MultiValueMap<String, String> typeLevelHeaders = (typeAnnotation != null ?
+			for (String rawValue: rawValues) {
-					parseHeaders(typeAnnotation.headers(), embeddedValueResolver) : null);
+				String[] pair = StringUtils.split(rawValue, "=");
-			if (!ObjectUtils.isEmpty(typeLevelHeaders)) {
+				if (pair == null) {
-				return typeLevelHeaders;
+					continue;
+				}
+				String name = pair[0].trim();
+				List<String> values = new ArrayList<>();
+				for (String value : StringUtils.commaDelimitedListToSet(pair[1])) {
+					if (embeddedValueResolver != null) {
+						value = embeddedValueResolver.resolveStringValue(value);
+					}
+					if (value != null) {
+						value = value.trim();
+						values.add(value);
+					}
+				}
+				if (!values.isEmpty()) {
+					outputHeaders.addAll(name, values);
+				}
 			}
-
-			return null;
 		}
 
 		private static List<AnnotationDescriptor> getAnnotationDescriptors(AnnotatedElement element) {

spring-web/src/test/java/org/springframework/web/service/invoker/HttpServiceMethodTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -348,8 +348,10 @@ class HttpServiceMethodTests {
 		@PostExchange(url = "/url", contentType = APPLICATION_JSON_VALUE, accept = APPLICATION_JSON_VALUE)
 		void performPost();
 
-		@HttpExchange(contentType = APPLICATION_JSON_VALUE, headers = {"CustomHeader=a,b, c",
+		@HttpExchange(
-				"Content-Type=" + APPLICATION_NDJSON_VALUE}, method = "GET")
+				method = "GET",
+				contentType = APPLICATION_JSON_VALUE,
+				headers = {"CustomHeader=a,b, c", "Content-Type=" + APPLICATION_NDJSON_VALUE})
 		void performGetWithHeaders();
 
 	}

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingHandlerMappingTests.java

@@ -430,7 +430,8 @@ class RequestMappingHandlerMappingTests {
 		@PostExchange(url = "/custom", contentType = "application/json", accept = "text/plain;charset=UTF-8")
 		public void customValuesExchange(){}
 
-		@HttpExchange(method="GET", url = "/headers",
+		@HttpExchange(
+				method="GET", url = "/headers",
 				headers = {"h1=hv1", "!h2", "Accept=application/ignored"})
 		public String customHeadersExchange() {
 			return "info";