fix(http): bracket IPv6 host in Host header

The Host header must wrap an IPv6 literal in brackets (RFC 7230), but
adjustheaders() used reqt.host as-is, which is unbracketed after
url.parse(). Use url.classify_host() to detect IPv6 and bracket it,
handling an already-bracketed input without doubling the brackets.

Closes #445

1 files changed, 2 insertions, 1 deletions

diff --git a/src/http.lua b/src/http.lua
index 259eb2b..64bbd8e 100644
--- a/src/http.lua
+++ b/src/http.lua
@@ -229,7 +229,8 @@ end
 
 local function adjustheaders(reqt)
     -- default headers
-    local host = reqt.host
+    local hosttype, host = url.classify_host(reqt.host)
+    if hosttype == "ipv6" then host = "[" .. host .. "]" end
     local port = tostring(reqt.port)
     if port ~= tostring(SCHEMES[reqt.scheme].port) then
         host = host .. ':' .. port end