Proxy Authentication

Hi Guys,

I am using a URLLoader class to send a request a script to a server and and capturing that response using the relevant event handlers. All works fine...internally...now I want to access that script from somewhere else and it doesn't work. The reason is because of the firewall. Now there is a proxy in place to allow incoming requests, but it requires authentication.

Is there a way to authenticate against the proxy using URLLoader?

I've been scanning the documentation and have read that you can use request-headers to achieve the required functionality, but for some reason I cannot get them to work. Any suggestions would be extremely useful.

Thanks