SPR-6248 - Accept header should not be mandatory for properly handling response body.

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/annotation/AnnotationMethodHandlerAdapter.java

@@ -56,8 +56,8 @@ import org.springframework.core.ParameterNameDiscoverer;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.http.HttpInputMessage;
 import org.springframework.http.HttpOutputMessage;
-import org.springframework.http.MediaType;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
 import org.springframework.http.converter.ByteArrayHttpMessageConverter;
 import org.springframework.http.converter.FormHttpMessageConverter;
 import org.springframework.http.converter.HttpMessageConverter;
@@ -779,6 +779,9 @@ public class AnnotationMethodHandlerAdapter extends WebContentGenerator implemen
 		private void handleResponseBody(Object returnValue, ServletWebRequest webRequest) throws ServletException, IOException {
 			HttpInputMessage inputMessage = new ServletServerHttpRequest(webRequest.getRequest());
 			List<MediaType> acceptedMediaTypes = inputMessage.getHeaders().getAccept();
+			if (acceptedMediaTypes.isEmpty()) {
+				acceptedMediaTypes = Collections.singletonList(MediaType.ALL);
+			}
 			HttpOutputMessage outputMessage = new ServletServerHttpResponse(webRequest.getResponse());
 			Class<?> returnValueType = returnValue.getClass();
 			List<MediaType> allSupportedMediaTypes = new ArrayList<MediaType>();

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/mvc/annotation/ServletAnnotationControllerTests.java

@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *      http://www.apache.org/licensesch/LICENSE-2.0
+ *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -970,6 +970,7 @@ public class ServletAnnotationControllerTests {
 		request.addHeader("Accept", "text/*");
 		MockHttpServletResponse response = new MockHttpServletResponse();
 		servlet.service(request, response);
+		assertEquals(200, response.getStatus());
 		assertEquals(requestBody, response.getContentAsString());
 	}
 
@@ -1016,6 +1017,20 @@ public class ServletAnnotationControllerTests {
 		assertNotNull("No Accept response header set", response.getHeader("Accept"));
 	}
 
+	@Test
+	public void responseBodyNoAcceptHeader() throws ServletException, IOException {
+		initServlet(RequestBodyController.class);
+
+		MockHttpServletRequest request = new MockHttpServletRequest("PUT", "/something");
+		String requestBody = "Hello World";
+		request.setContent(requestBody.getBytes("UTF-8"));
+		request.addHeader("Content-Type", "text/plain; charset=utf-8");
+		MockHttpServletResponse response = new MockHttpServletResponse();
+		servlet.service(request, response);
+		assertEquals(200, response.getStatus());
+		assertEquals(requestBody, response.getContentAsString());
+	}
+
 	@Test
 	public void badRequestRequestBody() throws ServletException, IOException {
 		@SuppressWarnings("serial") DispatcherServlet servlet = new DispatcherServlet() {