HTTP 305

Hy !
I'm writing a webbrowser using wininet , withh no automatic location
redirects.
But , for some sites , I get an HTTP 305 Use proxy error.
For Dial-up users , there is no problem: I use the proxy from the Location
header.

But , for LAN access (LAN through proxy access) , I must instruct the LAN's
proxy to foward the request to the proxy contained by the Location header.

I don't know how to do that.....

Somebody can help me please ??

PS   Please reply to djlynx@home.ro too.

                Thank you ,    Alex