HttpRequestValues.Processor exposes MethodParameter[]

Closes gh-35148

Author: rstoyanchev

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

@@ -27,6 +27,7 @@
 
 import org.jspecify.annotations.Nullable;
 
+import org.springframework.core.MethodParameter;
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
@@ -240,11 +241,12 @@ public interface Processor {
 		 * Invoked after argument resolvers have been called, and before the
 		 * {@link HttpRequestValues} is built.
 		 * @param method the {@code @HttpExchange} method
+		 * @param parameters provides access to method parameter information
 		 * @param arguments the raw argument values to the method
 		 * @param builder the builder to add request values too; the builder
 		 * also exposes method {@link Metadata} from the {@code HttpExchange} method.
 		 */
-		void process(Method method, @Nullable Object[] arguments, Builder builder);
+		void process(Method method, MethodParameter[] parameters, @Nullable Object[] arguments, Builder builder);
 
 	}
 

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

@@ -133,7 +133,7 @@ public Method getMethod() {
 	public @Nullable Object invoke(@Nullable Object[] arguments) {
 		HttpRequestValues.Builder requestValues = this.requestValuesInitializer.initializeRequestValuesBuilder();
 		applyArguments(requestValues, arguments);
-		this.requestValuesProcessor.process(this.method, arguments, requestValues);
+		this.requestValuesProcessor.process(this.method, this.parameters, arguments, requestValues);
 		return this.responseFunction.execute(requestValues.build());
 	}
 

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

@@ -32,6 +32,7 @@
 import org.springframework.aop.framework.ReflectiveMethodInvocation;
 import org.springframework.core.KotlinDetector;
 import org.springframework.core.MethodIntrospector;
+import org.springframework.core.MethodParameter;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.format.support.DefaultFormattingConversionService;
@@ -302,9 +303,12 @@ private record CompositeHttpRequestValuesProcessor(List<HttpRequestValues.Proces
 			implements HttpRequestValues.Processor {
 
 		@Override
-		public void process(Method method, @Nullable Object[] arguments, HttpRequestValues.Builder builder) {
+		public void process(
+				Method method, MethodParameter[] parameters, @Nullable Object[] arguments,
+				HttpRequestValues.Builder builder) {
+
 			for (HttpRequestValues.Processor processor : this.processors) {
-				processor.process(method, arguments, builder);
+				processor.process(method, parameters, arguments, builder);
 			}
 		}
 	}

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

@@ -227,7 +227,7 @@ void httpRequestValuesProcessor() {
 
 		HttpServiceProxyFactory.builder()
 				.exchangeAdapter(this.client)
-				.httpRequestValuesProcessor((m, a, builder) -> builder.addAttribute("foo", "a"))
+				.httpRequestValuesProcessor((m, p, a, builder) -> builder.addAttribute("foo", "a"))
 				.build()
 				.createClient(Service.class)
 				.execute();