Question

I have a website at example.com and I am serving all external resources from cdn.example.com. So in my HTML page at example.com I have something like:

<script type="text/javascript" src="http://cdn.example.com/script.js"></script>

In my script I want to create a Web Worker, so I do:

worker = new Worker("http://cdn.example.com/script.js");

But this fails on Firefox 16 with Failed to load script: http://cdn.example.com/script.js (nsresult = 0x805303f4) error. It works on Safari 6 and Chrome 22.

It seems the problem is because origins differ. Effective origin of the script is example.com and cdn.example.com does not match that. This seems a bug because not CORS not setting document.domain helps (or at least I couldn’t make it to work by playing with that). Is there any way to make it work?

Answer 1

At the end I made website at example.com serve a simple JavaScript code which includes the real web worked code:

importScripts('http://cdn.example.com/script.js');

and then create web worker by pointing to that.