Finally I get it working. I have to associate a 2** code with a bogus empty representaton (null representation doesn't work). Is this a bug in restlet?
<code>
// inside my resource class
getResponse().setStatus(Status.SUCCESS_NO_CONTENT, "No Data");
return new StringRepresentation("", MediaType.ALL);
</code>
BTW, I can use 204 or my customized 299.
Thanks again.
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