From 86741ad489c3ee2d519eeb071be846721b90412c Mon Sep 17 00:00:00 2001
From: embeddedt <42941056+embeddedt@users.noreply.github.com>
Date: Thu, 13 May 2021 04:13:34 -0400
Subject: Fix: [Emscripten] Force secure WebSockets over HTTPS (#9248)

---
 os/emscripten/pre.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'os')

diff --git a/os/emscripten/pre.js b/os/emscripten/pre.js
index 82664004e..2fb641017 100644
--- a/os/emscripten/pre.js
+++ b/os/emscripten/pre.js
@@ -9,7 +9,15 @@ Module['websocket'] = { url: function(host, port, proto) {
      * If you run your own server you can setup your own WebSocket proxy in
      * front of it and let people connect to your server via the proxy. You
      * are best to add another "if" statement as above for this. */
-    return null;
+
+    if (location.protocol === 'https:') {
+        /* Insecure WebSockets do not work over HTTPS, so we force
+         * secure ones. */
+        return 'wss://';
+    } else {
+        /* Use the default provided by Emscripten. */
+        return null;
+    }
 } };
 
 Module.preRun.push(function() {
-- 
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