Need to create a preloader that forces a reload from the server, and not the cache

Hello fellow Kirupians,

This is something I’ve been struggling with for some time, but now I urgently need to come up with a solution for a new project: I need to create a preloader that forces a reload of the Main.swf from the server, and not from the user’s cache.

This is because the site (for a big music festival) will get frequent updates, and users will visit more than once.

I have my HTML-metatags set up like this:

<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
        
<meta http-equiv="Expires" content ="0" />
        
<meta http-equiv="Pragma" content ="no-cache" />

…but these get kind of, uhm, ignored?

So now I’m looking for a solution in my AS3 preloader.
I’ve tried this trick, that works fine with xml-files, but with swf’s it doesn’t seem to work:

l.load(new URLRequest("Main.swf"  + new Date().getTime()));

Is there any solution out there?