From 37fb265ed9da43e3fb01a428e7d3efa6c984cb29 Mon Sep 17 00:00:00 2001
From: Robin Karlsson <61623634+robinkar@users.noreply.github.com>
Date: Wed, 1 Jun 2022 15:40:05 +0300
Subject: [PATCH] Accept capitalization in HTTP upgrade header (#150961)

---
 src/vs/server/node/remoteExtensionHostAgentServer.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vs/server/node/remoteExtensionHostAgentServer.ts b/src/vs/server/node/remoteExtensionHostAgentServer.ts
index 09aafc649a7..07a850e5ccf 100644
--- a/src/vs/server/node/remoteExtensionHostAgentServer.ts
+++ b/src/vs/server/node/remoteExtensionHostAgentServer.ts
@@ -192,7 +192,7 @@ export class RemoteExtensionHostAgentServer extends Disposable implements IServe
 			}
 		}
 
-		if (req.headers['upgrade'] !== 'websocket') {
+		if (req.headers['upgrade'] === undefined || req.headers['upgrade'].toLowerCase() !== 'websocket') {
 			socket.end('HTTP/1.1 400 Bad Request');
 			return;
 		}