Consistent and lenient HttpMethod resolution across all web modules

Issue: SPR-13776

spring-web/src/test/java/org/springframework/mock/web/test/MockMultipartHttpServletRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -128,7 +128,7 @@ public class MockMultipartHttpServletRequest extends MockHttpServletRequest impl
 
 	@Override
 	public HttpMethod getRequestMethod() {
-		return HttpMethod.valueOf(getMethod());
+		return HttpMethod.resolve(getMethod());
 	}
 
 	@Override