refactor

ngin/internal/util.go

@@ -0,0 +1,14 @@
+package internal
+
+import "net/http"
+
+const xForwardFor = "X-Forward-For"
+
+// Returns the peer address, supports X-Forward-For
+func GetRemoteAddr(r *http.Request) string {
+	v := r.Header.Get(xForwardFor)
+	if len(v) > 0 {
+		return v
+	}
+	return r.RemoteAddr
+}