From 087f126cf4c8750424b26f177aa7f426be806b7f Mon Sep 17 00:00:00 2001
From: Alexander Graf <ghostwheel42@users.noreply.github.com>
Date: Sat, 29 Oct 2022 22:35:44 +0200
Subject: caddyhttp: Canonicalize header field names (#5176)

---
 modules/caddyhttp/staticresp.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'modules/caddyhttp/staticresp.go')

diff --git a/modules/caddyhttp/staticresp.go b/modules/caddyhttp/staticresp.go
index 411a7bc..add5b12 100644
--- a/modules/caddyhttp/staticresp.go
+++ b/modules/caddyhttp/staticresp.go
@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/textproto"
 	"os"
 	"strconv"
 	"strings"
@@ -193,7 +194,7 @@ func (s StaticResponse) ServeHTTP(w http.ResponseWriter, r *http.Request, next H
 
 	// set all headers
 	for field, vals := range s.Headers {
-		field = repl.ReplaceAll(field, "")
+		field = textproto.CanonicalMIMEHeaderKey(repl.ReplaceAll(field, ""))
 		newVals := make([]string, len(vals))
 		for i := range vals {
 			newVals[i] = repl.ReplaceAll(vals[i], "")
-- 
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