Web browser, proxy, authentication

Hi,

I have created web browser that surf to the internet through proxy and now I need to create a browser that surf to internet via proxy authentication server (server required enter username and password) and I don`t know which one component has ability to describe proxy username and password... :/

Maybe something has know ?

Sry, 4 my English

We don't allow talking about auto site settings, as it's to easy to mis-use.