Change MIME mapping for .js from application/javascript to text/javascript

This application/javascript MIME type is deprecated.

This commit therefore changes the MIME type mapping for *.js files from
application/javascript to text/javascript in order to align with
industry standards.

Closes gh-33197

Author: sbrannen

spring-test/src/test/java/org/springframework/test/context/aot/samples/web/WebSpringJupiterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -64,7 +64,7 @@ void controller(@Value("${test.engine}") String testEngine) throws Exception {
 	void resources() throws Exception {
 		this.mockMvc.perform(get("/resources/Spring.js"))
 			.andExpectAll(
-				content().contentType("application/javascript"),
+				content().contentType("text/javascript"),
 				content().string(containsString("Spring={};"))
 			);
 	}

spring-test/src/test/java/org/springframework/test/web/servlet/samples/client/context/WebAppResourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -69,7 +69,7 @@ public void resourceRequest() {
 		testClient.get().uri("/resources/Spring.js")
 				.exchange()
 				.expectStatus().isOk()
-				.expectHeader().contentType("application/javascript")
+				.expectHeader().contentType("text/javascript")
 				.expectBody(String.class).value(containsString("Spring={};"));
 	}
 

spring-test/src/test/java/org/springframework/test/web/servlet/samples/context/WebAppResourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -67,7 +67,7 @@ public void setup() {
 	@Test
 	public void resourceRequest() throws Exception {
 		this.mockMvc.perform(get("/resources/Spring.js"))
-			.andExpect(content().contentType("application/javascript"))
+			.andExpect(content().contentType("text/javascript"))
 			.andExpect(content().string(containsString("Spring={};")));
 	}
 

spring-web/src/main/resources/org/springframework/http/mime.types

@@ -146,7 +146,7 @@ application/ipfix				ipfix
 application/java-archive			jar
 application/java-serialized-object		ser
 application/java-vm				class
-application/javascript				js
+# application/javascript				js
 # application/jose
 # application/jose+json
 # application/jrd+json
@@ -1686,7 +1686,7 @@ text/csv					csv
 # text/fwdred
 # text/grammar-ref-list
 text/html					html htm
-# text/javascript
+text/javascript				js
 # text/jcr-cnd
 # text/markdown
 # text/mizar

spring-web/src/test/java/org/springframework/http/MediaTypeFactoryTests.java

@@ -30,7 +30,7 @@ class MediaTypeFactoryTests {
 	@Test
 	void getMediaType() {
 		assertThat(MediaTypeFactory.getMediaType("file.xml")).contains(MediaType.APPLICATION_XML);
-		assertThat(MediaTypeFactory.getMediaType("file.js")).contains(MediaType.parseMediaType("application/javascript"));
+		assertThat(MediaTypeFactory.getMediaType("file.js")).contains(MediaType.parseMediaType("text/javascript"));
 		assertThat(MediaTypeFactory.getMediaType("file.css")).contains(MediaType.parseMediaType("text/css"));
 		assertThat(MediaTypeFactory.getMediaType("file.foobar")).isNotPresent();
 	}

spring-webflux/src/test/java/org/springframework/web/reactive/resource/ResourceWebHandlerTests.java

@@ -606,7 +606,7 @@ void getResourceFromSubDirectory() throws Exception {
 			setBestMachingPattern(exchange, "/**");
 			this.handler.handle(exchange).block(TIMEOUT);
 
-			assertThat(exchange.getResponse().getHeaders().getContentType()).isEqualTo(MediaType.parseMediaType("application/javascript"));
+			assertThat(exchange.getResponse().getHeaders().getContentType()).isEqualTo(MediaType.parseMediaType("text/javascript"));
 			assertResponseBody(exchange, "function foo() { console.log(\"hello world\"); }");
 		}
 
@@ -619,12 +619,11 @@ void getResourceFromSubDirectoryOfAlternatePath() throws Exception {
 			this.handler.handle(exchange).block(TIMEOUT);
 
 			HttpHeaders headers = exchange.getResponse().getHeaders();
-			assertThat(headers.getContentType()).isEqualTo(MediaType.parseMediaType("application/javascript"));
+			assertThat(headers.getContentType()).isEqualTo(MediaType.parseMediaType("text/javascript"));
 			assertResponseBody(exchange, "function foo() { console.log(\"hello world\"); }");
 		}
 
-		@Test
-			// gh-27538, gh-27624
+		@Test  // gh-27538, gh-27624
 		void filterNonExistingLocations() throws Exception {
 			this.handler.afterPropertiesSet();
 			ResourceWebHandler handler = new ResourceWebHandler();