From 89994619408074fe948bcbe2e93a2d729addec3a Mon Sep 17 00:00:00 2001
From: Panayiotis Lipiridis <lipiridis@gmail.com>
Date: Fri, 5 Feb 2021 01:47:19 +0200
Subject: [PATCH] source

---
 src/index.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/index.ts b/src/index.ts
index 91acf94..a020add 100755
--- a/src/index.ts
+++ b/src/index.ts
@@ -24,7 +24,8 @@ const io = socketIO(server, {
   handlePreflightRequest: function (req, res) {
     const headers = {
       "Access-Control-Allow-Headers": "Content-Type, Authorization",
-      "Access-Control-Allow-Origin": "*",
+      "Access-Control-Allow-Origin":
+        (req.header && req.header.origin) || "https://excalidraw.com",
       "Access-Control-Allow-Credentials": true,
     };
     res.writeHead(200, headers);