TCP Socket though proxy - Programmers Heaven

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TCP Socket though proxy

I have to modify a C client/server program that opens a TCP socket from the client to the server. Recently my company installed a firewall between the various (physical) sites we run and now. So, every outgoing connection passes though a proxy server. That of course is a huge problem for the program. Unfortunately, the original programmer is not among us anymore and I have to fulfill the management's request and modify the program in order to use the proxy.
I searched on the internet but I did not find very useful information on the matter. So, is it possible to open a socket via an HTTP proxy? If yes, how on earth can I do that?
Note: The program uses libneon for some HTTP requests, namely, an HTTP authentication. That part is OK since libneon supports proxies. But the rest of the program uses plain old sockets...
Thank you in advance


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