Wei Zhang created CXF-6340:
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             Summary: Return value of AsyncResponseImpl.cancel() not follow 
JAXRS 2.0 javadoc
                 Key: CXF-6340
                 URL: https://issues.apache.org/jira/browse/CXF-6340
             Project: CXF
          Issue Type: Bug
          Components: JAX-RS
    Affects Versions: 3.0.4
            Reporter: Wei Zhang


According to JAX-RS2.0 javadoc:
Invoking a cancel(...) method multiple times to cancel request processing has 
the same effect as canceling the request processing only once. Invoking a 
cancel(...) method on an asynchronous response instance that has already been 
cancelled or resumed has no effect and the method call is ignored while 
returning true, in case the request has been cancelled previously. 

But current implementation of AsyncResponseImpl.cancel() return false when 
response instance has already been cancelled or resumed.
In method doCancel, found:
    private synchronized boolean doCancel(String retryAfterHeader) {
        if (!isSuspended()) {
            return false;        



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