How to use Chttp with post method

I want to use the HTTP POST method with the mfc CHttp class.I m using HTTP_VERB_POST in opwnrequest . All things are going in proper way. But I don't undeerstand how should I send the parameters to cgi script.
I tried it with szHeader with AddRequestHeaders and SendRequest
But it didn't work
I need the correct format that I should send  !!!!
xpashAsked:
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chensuCommented:
HOWTO: Simulate a Form POST Request Using WinInet
http://support.microsoft.com/support/kb/articles/q165/2/98.asp
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mikeblasCommented:
The correct format, and the list of headers you need, is going to be dependent on exactly what's running on the server to answer the request.

You should use a network sniffer, or WININET's trace mode, to see what IE sends when you interact with the target page manually. Then, you have a perfect idea of what you need to send in your programmatic POST request.

..B ekiM
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