Httpunit tests fail against EAP 6 for custom error response codes

Issue

• We use httpunit to run test cases against JBoss. All test cases worked against EAP 5, but with EAP 6, the test client fails if a test involves a response with a custom error response code (some untypical HTTP response 400 or greater):

Server returned HTTP response code: 453 for URL: http://localhost:8080/helloworld/453.jsp
java.io.IOException: Server returned HTTP response code: 453 for URL: http://localhost:8080/helloworld/453.jsp
    at sun.reflect.GeneratedConstructorAccessor1.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
    at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1458)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1452)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1106)
    at com.meterware.httpunit.HttpWebResponse.getInputStream(HttpWebResponse.java:88)
    at com.meterware.httpunit.HttpWebResponse.<init>(HttpWebResponse.java:61)
    at com.meterware.httpunit.HttpWebResponse.<init>(HttpWebResponse.java:68)
    at com.meterware.httpunit.WebConversation.newResponse(WebConversation.java:83)
    at com.meterware.httpunit.WebClient.createResponse(WebClient.java:647)
    at com.meterware.httpunit.WebWindow.getResource(WebWindow.java:220)
    at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:181)
    at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:158)
    at com.meterware.httpunit.WebClient.getResponse(WebClient.java:122)
    at ExampleTest.tryGetResponse(ExampleTest.java:49)
    at ExampleTest.testWelcomePage(ExampleTest.java:72)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at junit.framework.TestSuite.runTest(TestSuite.java:208)
    at junit.framework.TestSuite.run(TestSuite.java:203)
    at junit.textui.TestRunner.doRun(TestRunner.java:116)
    at junit.textui.TestRunner.doRun(TestRunner.java:109)
    at junit.textui.TestRunner.run(TestRunner.java:72)
    at ExampleTest.main(ExampleTest.java:17)
Caused by: java.io.IOException: Server returned HTTP response code: 453 for URL: http://localhost:8080/helloworld/453.jsp
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1403)
    at sun.net.www.protocol.http.HttpURLConnection.getHeaderFieldKey(HttpURLConnection.java:2267)
    at com.meterware.httpunit.HttpWebResponse.loadHeaders(HttpWebResponse.java:255)
    at com.meterware.httpunit.HttpWebResponse.readHeaders(HttpWebResponse.java:237)
    at com.meterware.httpunit.HttpWebResponse.<init>(HttpWebResponse.java:57)
    ... 25 more