From 873cce27b8f1b7900ea08c85b2d563ddd478a38a Mon Sep 17 00:00:00 2001
From: "Dayan C. Galiazzi" <galiazzi.dayan@gmail.com>
Date: Tue, 24 Aug 2021 19:55:32 -0300
Subject: fix(ext/http): websocket upgrade header check (#11830)

---
 ext/http/01_http.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'ext/http')

diff --git a/ext/http/01_http.js b/ext/http/01_http.js
index b14a0d352..073cc7a7c 100644
--- a/ext/http/01_http.js
+++ b/ext/http/01_http.js
@@ -341,7 +341,8 @@
   const _ws = Symbol("[[associated_ws]]");
 
   function upgradeWebSocket(request, options = {}) {
-    if (request.headers.get("upgrade") !== "websocket") {
+    const upgrade = request.headers.get("upgrade");
+    if (!upgrade || StringPrototypeToLowerCase(upgrade) !== "websocket") {
       throw new TypeError(
         "Invalid Header: 'upgrade' header must be 'websocket'",
       );
-- 
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