Log HTTP request

// logRequest logs the request processed by next. Each request is
// timed and it's response code logged.
func logRequest(next http.Handler) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		// initialize the status to 200 in case WriteHeader is not called
		rec := statusRecorder{w, 200}
		next.ServeHTTP(&rec, r)
		debug.Println(r.Method, r.URL.Path, rec.status, time.Since(start))
	}
}

type statusRecorder struct {
	http.ResponseWriter
	status int
}

// record status code
func (rec *statusRecorder) WriteHeader(code int) {
	rec.status = code
	rec.ResponseWriter.WriteHeader(code)
}