From f1a8819fa76ed918703fe63dbd730fc4aa46599f Mon Sep 17 00:00:00 2001
From: Martin Polden <martin.polden@gmail.com>
Date: Mon, 19 Nov 2012 23:45:51 +0100
Subject: [PATCH] Read X-Real-IP header if set

---
 ifconfig.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ifconfig.go b/ifconfig.go
index 9bd8417..467bee5 100644
--- a/ifconfig.go
+++ b/ifconfig.go
@@ -26,7 +26,14 @@ func handler(w http.ResponseWriter, req *http.Request) {
         return
     }
 
-    host, _, err := net.SplitHostPort(req.RemoteAddr)
+    var host string
+    var err error
+    realIP := req.Header.Get("X-Real-IP")
+    if realIP != "" {
+        host = realIP
+    } else {
+        host, _, err = net.SplitHostPort(req.RemoteAddr)
+    }
     if err != nil {
         log.Printf("Failed to parse remote address: %s\n", req.RemoteAddr)
         http.Error(w, "Failed to parse remote address", 500)