From 8cea021d9708fa1370594863b1fafef292ab72ef Mon Sep 17 00:00:00 2001
From: Allan Que <allan.que@gmail.com>
Date: Sun, 5 Jul 2026 19:43:49 -0500
Subject: [PATCH] Add IPv6 support to Host header

---
 http.lua | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/http.lua b/http.lua
index 947a761..e68bc02 100644
--- a/http.lua
+++ b/http.lua
@@ -681,7 +681,12 @@ function M.send(method, t)
 
         if not t.headers.host then
             -- 'Host' header must be provided for HTTP/1.1
-            table.insert(hdr_tbl, "host: " .. host)
+            if addr:find(":") and not addr:match("^%[.*%]$") then
+                -- Enclose IPv6 addresses in square brackets
+                table.insert(hdr_tbl, string.format("host: [%s]:%s", addr, port))
+            else
+                table.insert(hdr_tbl, "host: " .. host)
+            end
         end
 
         if not t.headers["accept"] then