fixbug:superfluous response.WriteHeader #3083
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In special cases where the method (http.Write) is needed for business logic, within the interceptor TimeoutHandler, WriteHeader code:200 is automatically written inside the overwritten method (timeriter.write), Then the case <-done of timeoutHandler.ServeHTTP continues to call the method (WriteHeader, Write), resulting in an error "http: superfluous response.WriteHeader call from ..."