use http.StatusOK as initial value for responseLogger.status #103
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When handler never call w.WriteHeader or w.Write. LoggingHandler will print 0 as the status code. But client actually get 200.
After ServeHTTP finished, Go HTTP library will call WriteHeader(StatusOK) if wroteHeader is false.
Take a look at the function "finishRequest" in https://github.com/golang/go/blob/master/src/net/http/server.go
So, we should init responseLogger.status with http.StatusOK.