fix: make logging middleware respect proxy headers

middlewares/logging.go

@@ -39,10 +39,21 @@ func (lg *LoggingMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		r.URL.String(),
 		duration,
 		ww.BytesWritten(),
-		r.RemoteAddr,
+		readUserIP(r),
 	)
 }
 
+func readUserIP(r *http.Request) string {
+	ip := r.Header.Get("X-Real-Ip")
+	if ip == "" {
+		ip = r.Header.Get("X-Forwarded-For")
+	}
+	if ip == "" {
+		ip = r.RemoteAddr
+	}
+	return ip
+}
+
 // The below writer-wrapping code has been lifted from
 // https://github.com/zenazn/goji/blob/master/web/middleware/logger.go - because
 // it does exactly what is needed, and it's unlikely to change in any