From e749c9c6c9b2f3db640021d09d66d953137ab70e Mon Sep 17 00:00:00 2001
From: Yashpal Choudhary <yashpal.c1995@gmail.com>
Date: Sat, 20 Oct 2018 03:07:22 +0530
Subject: [PATCH] frontend/http: canonicalize http real_ip_header

Fixes #428
---
 frontend/http/parser.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/frontend/http/parser.go b/frontend/http/parser.go
index 3053d82..1d276cb 100644
--- a/frontend/http/parser.go
+++ b/frontend/http/parser.go
@@ -153,8 +153,8 @@ func requestedIP(r *http.Request, p bittorrent.Params, opts ParseOptions) (ip ne
 	}
 
 	if opts.RealIPHeader != "" {
-		if ips, ok := r.Header[opts.RealIPHeader]; ok && len(ips) > 0 {
-			return net.ParseIP(ips[0]), false
+		if ip := r.Header.Get(opts.RealIPHeader); ip != "" {
+			return net.ParseIP(ip), false
 		}
 	}