Remove usages of Framework's MediaType.APPLICATION_GRAPHQL

Closes gh-1109

Author: bclozel

spring-graphql/src/main/java/org/springframework/graphql/client/HttpGraphQlTransport.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.
@@ -48,9 +48,8 @@ final class HttpGraphQlTransport implements GraphQlTransport {
 	private static final ParameterizedTypeReference<ServerSentEvent<Map<String, Object>>> SSE_TYPE =
 			new ParameterizedTypeReference<ServerSentEvent<Map<String, Object>>>() { };
 
-	// To be removed in favor of Framework's MediaType.APPLICATION_GRAPHQL_RESPONSE
-	private static final MediaType APPLICATION_GRAPHQL_RESPONSE =
-			new MediaType("application", "graphql-response+json");
+	private static final MediaType APPLICATION_GRAPHQL =
+			new MediaType("application", "graphql+json");
 
 
 	private final WebClient webClient;
@@ -73,11 +72,10 @@ private static MediaType initContentType(WebClient webClient) {
 
 
 	@Override
-	@SuppressWarnings("removal")
 	public Mono<GraphQlResponse> execute(GraphQlRequest request) {
 		return this.webClient.post()
 				.contentType(this.contentType)
-				.accept(MediaType.APPLICATION_JSON, APPLICATION_GRAPHQL_RESPONSE, MediaType.APPLICATION_GRAPHQL)
+				.accept(MediaType.APPLICATION_JSON, MediaType.APPLICATION_GRAPHQL_RESPONSE, APPLICATION_GRAPHQL)
 				.bodyValue(request.toMap())
 				.attributes((attributes) -> {
 					if (request instanceof ClientGraphQlRequest clientRequest) {

spring-graphql/src/main/java/org/springframework/graphql/server/webflux/GraphQlHttpHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.
@@ -36,9 +36,11 @@
  */
 public class GraphQlHttpHandler extends AbstractGraphQlHttpHandler {
 
-	@SuppressWarnings("removal")
+	private static final MediaType APPLICATION_GRAPHQL =
+			new MediaType("application", "graphql+json");
+
 	private static final List<MediaType> SUPPORTED_MEDIA_TYPES = List.of(
-			MediaType.APPLICATION_GRAPHQL_RESPONSE, MediaType.APPLICATION_JSON, MediaType.APPLICATION_GRAPHQL);
+			MediaType.APPLICATION_GRAPHQL_RESPONSE, MediaType.APPLICATION_JSON, APPLICATION_GRAPHQL);
 
 
 	/**

spring-graphql/src/main/java/org/springframework/graphql/server/webmvc/GraphQlHttpHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.
@@ -41,9 +41,11 @@
  */
 public class GraphQlHttpHandler extends AbstractGraphQlHttpHandler {
 
-	@SuppressWarnings("removal")
+	private static final MediaType APPLICATION_GRAPHQL =
+			new MediaType("application", "graphql+json");
+
 	private static final List<MediaType> SUPPORTED_MEDIA_TYPES = List.of(
-			MediaType.APPLICATION_GRAPHQL_RESPONSE, MediaType.APPLICATION_JSON, MediaType.APPLICATION_GRAPHQL);
+			MediaType.APPLICATION_GRAPHQL_RESPONSE, MediaType.APPLICATION_JSON, APPLICATION_GRAPHQL);
 
 
 	/**