From 508fe2ce52a92a6b7f2568cb19bc1bc00ecfca4a Mon Sep 17 00:00:00 2001
From: zzz <zzz@i2pmail.org>
Date: Sat, 26 Apr 2025 08:54:16 -0400
Subject: [PATCH] i2ptunnel: Canonicalize Host header at the server proxy

to prevent duplicate headers being sent to the server
resulting in 400 errors
as reported by altonen
---
 .../java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java         | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java b/apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java
index 3e1fca1fa..9058a1665 100644
--- a/apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java
+++ b/apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java
@@ -1224,6 +1224,8 @@ public class I2PTunnelHTTPServer extends I2PTunnelServer {
                     name = "Referer";
                 else if ("connection".equals(lcName))
                     name = "Connection";
+                else if ("host".equals(lcName))
+                    name = "Host";
 
                 // For incoming, we remove certain headers to prevent spoofing.
                 // For outgoing, we remove certain headers to improve anonymity.