Polishing contribution

Closes gh-34645

Author: bclozel

spring-web/src/main/java/org/springframework/http/codec/protobuf/ProtobufCodecSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.
@@ -33,6 +33,7 @@ public abstract class ProtobufCodecSupport {
 
 	static final MimeType[] MIME_TYPES = new MimeType[]{
 			new MimeType("application", "x-protobuf"),
+			new MimeType("application", "*+x-protobuf"),
 			new MimeType("application", "octet-stream"),
 			new MimeType("application", "vnd.google.protobuf")
 	};

spring-web/src/test/java/org/springframework/http/codec/protobuf/ProtobufDecoderTests.java

@@ -70,6 +70,7 @@ void extensionRegistryNull() {
 	public void canDecode() {
 		assertThat(this.decoder.canDecode(forClass(Msg.class), null)).isTrue();
 		assertThat(this.decoder.canDecode(forClass(Msg.class), MediaType.APPLICATION_PROTOBUF)).isTrue();
+		assertThat(this.decoder.canDecode(forClass(Msg.class), MediaType.parseMediaType("application/vnd.example.public.v1+x-protobuf"))).isTrue();
 		assertThat(this.decoder.canDecode(forClass(Msg.class), MediaType.APPLICATION_OCTET_STREAM)).isTrue();
 		assertThat(this.decoder.canDecode(forClass(Msg.class), MediaType.APPLICATION_JSON)).isFalse();
 		assertThat(this.decoder.canDecode(forClass(Object.class), MediaType.APPLICATION_PROTOBUF)).isFalse();

spring-web/src/test/java/org/springframework/http/codec/protobuf/ProtobufEncoderTests.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.
@@ -45,10 +45,10 @@ class ProtobufEncoderTests extends AbstractEncoderTests<ProtobufEncoder> {
 
 	private static final MimeType PROTOBUF_MIME_TYPE = new MimeType("application", "x-protobuf");
 
-	private Msg msg1 =
+	private final Msg msg1 =
 			Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(123).build()).build();
 
-	private Msg msg2 =
+	private final Msg msg2 =
 			Msg.newBuilder().setFoo("Bar").setBlah(SecondMsg.newBuilder().setBlah(456).build()).build();
 
 
@@ -61,6 +61,7 @@ public ProtobufEncoderTests() {
 	protected void canEncode() {
 		assertThat(this.encoder.canEncode(forClass(Msg.class), null)).isTrue();
 		assertThat(this.encoder.canEncode(forClass(Msg.class), PROTOBUF_MIME_TYPE)).isTrue();
+		assertThat(this.encoder.canEncode(forClass(Msg.class), MediaType.parseMediaType("application/vnd.example.public.v1+x-protobuf"))).isTrue();
 		assertThat(this.encoder.canEncode(forClass(Msg.class), MediaType.APPLICATION_OCTET_STREAM)).isTrue();
 		assertThat(this.encoder.canEncode(forClass(Msg.class), MediaType.APPLICATION_JSON)).isFalse();
 		assertThat(this.encoder.canEncode(forClass(Object.class), PROTOBUF_MIME_TYPE)).isFalse();

spring-web/src/test/java/org/springframework/http/converter/protobuf/ProtobufHttpMessageConverterTests.java

@@ -45,10 +45,10 @@ class ProtobufHttpMessageConverterTests {
 
 	private ProtobufHttpMessageConverter converter = new ProtobufHttpMessageConverter();
 
-	private ExtensionRegistry extensionRegistry = mock();
+	private final ExtensionRegistry extensionRegistry = mock();
 
-	private Msg testMsg = Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(123).build()).build();
-	private MediaType testPlusProtoMediaType = MediaType.parseMediaType("application/vnd.example.public.v1+x-protobuf");
+	private final Msg testMsg = Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(123).build()).build();
+	private final MediaType testPlusProtoMediaType = MediaType.parseMediaType("application/vnd.example.public.v1+x-protobuf");
 
 
 	@Test

spring-web/src/test/java/org/springframework/http/converter/protobuf/ProtobufJsonFormatHttpMessageConverterTests.java

@@ -42,7 +42,7 @@ class ProtobufJsonFormatHttpMessageConverterTests {
 			JsonFormat.parser(), JsonFormat.printer());
 
 	private final Msg testMsg = Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(123).build()).build();
-	private MediaType testPlusProtoMediaType = MediaType.parseMediaType("application/vnd.examle.public.v1+x-protobuf");
+	private final MediaType testPlusProtoMediaType = MediaType.parseMediaType("application/vnd.example.public.v1+x-protobuf");
 
 
 	@Test