GWTTestCase - HTMLUnit - No permitted "Access-Control-Allow-Origin"

When running `GWTTestCase` that call an external Restful service with
GWT (Using Restlet-GWT) the app throws the error below.

**Error:**

Jan 05, 2015 1:24:41 PM
com.gargoylesoftware.htmlunit.javascript.background.JavaScriptJobManagerImpl
runSingleJob
SEVERE: Job run failed with unexpected RuntimeException: Wrapped
java.lang.RuntimeException: No permitted "Access-Control-Allow-Origin"
header.
net.sourceforge.htmlunit.corejs.javascript.WrappedException:
Wrapped java.lang.RuntimeException: No permitted
"Access-Control-Allow-Origin" header.
at
net.sourceforge.htmlunit.corejs.javascript.Context.throwAsScriptRuntimeEx(Context.java:1889)
at
com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.doSend(XMLHttpRequest.java:681)
at
com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.access$000(XMLHttpRequest.java:94)
at
com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest$1.run(XMLHttpRequest.java:603)
at
net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:602)
at
net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at
com.gargoylesoftware.htmlunit.javascript.background.JavascriptXMLHttpRequestJob.run(JavascriptXMLHttpRequestJob.java:36)
at
com.gargoylesoftware.htmlunit.javascript.background.JavaScriptJobManagerImpl.runSingleJob(JavaScriptJobManagerImpl.java:328)
at
com.gargoylesoftware.htmlunit.javascript.background.DefaultJavaScriptExecutor.run(DefaultJavaScriptExecutor.java:162)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.RuntimeException: No permitted
"Access-Control-Allow-Origin" header.
... 9 more

From my research this seems to be an issue that HTMLUnit would not
allow to access Cross-domain, is there a work around with this?

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