Fix negative trace substraction when using SetTimeout #1038
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In certain cases when using client or request SetTimeout it is possible that some trace value like
dnsDone
,tlsHandshakeDone
orgotConn
are zero, resulting in inaccurate results:This PR add additional checks in the
TraceInfo
method to avoid negative values.I'm not sure how to improve the tests for this, as aborting requests with SetTimeout will not always accurately stop the execution at the exact same point. I'm open to ideas.