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-rw-r--r--ext/http/01_http.js3
1 files changed, 2 insertions, 1 deletions
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'",
);