How Can I Efficiently Log Both HTTP Requests and Responses in Go?

Logging Both Requests and Responses in Go

When creating a complex application in Go, handling HTTP requests and responses efficiently is crucial. While the Gorilla web toolkit's mux and handler packages simplify request handling, logging responses remains a challenge.

To address this, the accepted answer by Eric Broda offers a solution that captures request details. However, it fails to log the actual response sent to the client. To resolve this, a modification to the code is necessary:

func logHandler(fn http.HandlerFunc) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        x, err := httputil.DumpRequest(r, true)
        if err != nil {
            http.Error(w, fmt.Sprint(err), http.StatusInternalServerError)
            return
        }
        log.Println(fmt.Sprintf("%q", x))
        rec := httptest.NewRecorder()
        fn(rec, r)
        log.Println(fmt.Sprintf("%q", rec.Body))        

        // this copies the recorded response to the response writer
        for k, v := range rec.HeaderMap {
            w.Header()[k] = v
        }
        w.WriteHeader(rec.Code)
        rec.Body.WriteTo(w)
    }
}

This modified code intercepts the response and copies it to the response writer, enabling logging of both requests and responses.

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