Http middle-ware access to response

[mantzas]

Hi,

i am relatively new to go.
i have written a logging middle-ware in order log some stuff.

func LoggingMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		startTime := time.Now()
		next.ServeHTTP(w, r)
		log.WithFields(log.Fields{"method": r.Method, "route": r.URL.String(), "status": "???", "time": time.Since(startTime)}).Debugln()
	})
}

I am trying to get the status from the http.Responsewriter.
Do i have to cast the writer to something in order to achieve this?

[mantzas]

@netixen how do i get from w http.ResponseWriter -> Response -> w.Status? like i said i am new and there is a missing link between them.

[Bjoern (Björn Graf)]

As far as I can tell you cannot and you have to implement the ResponseWriter interface to wrap the original one to intercept the stuff you’re interested in.
The Gorilla project has a handler package with a logging handler that demonstrates this at https://github.com/gorilla/handlers/blob/master/handlers.go#L102

[netixen]

@Bjoern is correct, the response I was thinking of is what you get on the client side.

[mantzas]

@Bjoern it seems that i have to study how gorilla does it and where in the pipeline the wrapper is been used.