Spring integration and intercepting HTTP request?

Greetings everyone,

I am new to Qt. I am attracted by the cross-platform capability of Qt, but before I dive in, I like to find out the answers to the following 2 questions:

1. What kind of integration is available between a Qt client and a Spring based JEE application running on a JBoss application server;
2. I need the client to intercept all HTTP request made from browsers and record the request url, of course, I don't expect Qt to provide that out of the box; I've done some basic research on some possibilities, on Windows I can use Winsock LSP, on Linux/OSX I can implement an HTTP proxy (but if you have better ways of doing it, please let me know and I'll be really appreciated); so if this intercepting code is different on different OS, how can a Qt client with that intercepting code embedded still be cross-platform?

Any advice/hint will be highly appreciated.