From 59358b0e812af18dac652f32ca8a445ffe9d2439 Mon Sep 17 00:00:00 2001
From: wi1dcard <wi1dcard.cn@gmail.com>
Date: Fri, 1 Nov 2024 11:40:48 +0800
Subject: [PATCH] Copy and append X-Forwarded-For header.

Fixes #22.
---
 pkg/reverseproxy/handler.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkg/reverseproxy/handler.go b/pkg/reverseproxy/handler.go
index 1d6a962..f842aef 100644
--- a/pkg/reverseproxy/handler.go
+++ b/pkg/reverseproxy/handler.go
@@ -50,6 +50,7 @@ func NewHTTPHandler(to *url.URL, reverseProxy *httputil.ReverseProxy, headerInje
 
 func (f *HTTPHandler) rewriteFunc(r *httputil.ProxyRequest) {
 	r.SetURL(f.To)
+	r.Out.Header["X-Forwarded-For"] = r.In.Header["X-Forwarded-For"]
 	r.SetXForwarded()
 
 	if f.PreserveHost {