Added readonly version of HttpHeaders

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@3072 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.web/src/test/java/org/springframework/http/client/AbstractHttpRequestFactoryTestCase.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2010 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.
@@ -124,7 +124,7 @@ public abstract class AbstractHttpRequestFactoryTestCase {
 		}
 	}
 
-	@Test(expected = IllegalStateException.class)
+	@Test(expected = UnsupportedOperationException.class)
 	public void headersAfterExecute() throws Exception {
 		ClientHttpRequest request = factory.createRequest(new URI(BASE_URL + "/echo"), HttpMethod.POST);
 		request.getHeaders().add("MyHeader", "value");