How can I use http binding with xiff?

Hello,

I really need my im client to be able to comunicate through corporate proxies and firewall.

The only valid option seems to be installing JabberHTTPBinding with Wildfire.

Suppose I manage that, how should I comunicate with it ? I reckon I should replace the XMLSocket handling with some code that sends XML over HTTP.

How ?

XML.sendAndLoad requires a destination URL. What would that be ?

Thanks.