Add application/graphql+json mime and media types

Closes gh-28271

spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java

@@ -65,6 +65,17 @@ public abstract class MimeTypeUtils {
 	 */
 	public static final String ALL_VALUE = "*/*";
 
+	/**
+	 * Public constant mime type for {@code application/graphql+json}.
+	 * @see <a href="https://github.com/graphql/graphql-over-http">GraphQL over HTTP spec</a>
+	 * */
+	public static final MimeType APPLICATION_GRAPHQL;
+
+	/**
+	 * A String equivalent of {@link MimeTypeUtils#APPLICATION_GRAPHQL}.
+	 */
+	public static final String APPLICATION_GRAPHQL_VALUE = "application/graphql+json";
+
 	/**
 	 * Public constant mime type for {@code application/json}.
 	 * */
@@ -165,6 +176,7 @@ public abstract class MimeTypeUtils {
 	static {
 		// Not using "parseMimeType" to avoid static init cost
 		ALL = new MimeType("*", "*");
+		APPLICATION_GRAPHQL = new MimeType("application", "graphql+json");
 		APPLICATION_JSON = new MimeType("application", "json");
 		APPLICATION_OCTET_STREAM = new MimeType("application", "octet-stream");
 		APPLICATION_XML = new MimeType("application", "xml");

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

@@ -95,6 +95,17 @@ public class MediaType extends MimeType implements Serializable {
 	 */
 	public static final String APPLICATION_FORM_URLENCODED_VALUE = "application/x-www-form-urlencoded";
 
+	/**
+	 * Public constant media type for {@code application/graphql+json}.
+	 * @see <a href="https://github.com/graphql/graphql-over-http">GraphQL over HTTP spec</a>
+	 */
+	public static final MediaType APPLICATION_GRAPHQL;
+
+	/**
+	 * A String equivalent of {@link MediaType#APPLICATION_GRAPHQL}.
+	 */
+	public static final String APPLICATION_GRAPHQL_VALUE = "application/graphql+json";
+
 	/**
 	 * Public constant media type for {@code application/json}.
 	 */
@@ -396,6 +407,7 @@ public class MediaType extends MimeType implements Serializable {
 		APPLICATION_ATOM_XML = new MediaType("application", "atom+xml");
 		APPLICATION_CBOR = new MediaType("application", "cbor");
 		APPLICATION_FORM_URLENCODED = new MediaType("application", "x-www-form-urlencoded");
+		APPLICATION_GRAPHQL = new MediaType("application", "graphql+json");
 		APPLICATION_JSON = new MediaType("application", "json");
 		APPLICATION_JSON_UTF8 = new MediaType("application", "json", StandardCharsets.UTF_8);
 		APPLICATION_NDJSON = new MediaType("application", "x-ndjson");