Send a XML-File via HTTP_POST to a server

[deep_though]

Hi

I have the following problem:
For make a new entry to a SMS-tool (written in JSP), i have to send a XML-File to the interface. This has to be done via HTTP_POST. How can I do that?

I assume that the best way is to do it with popen, somehow like that:

popen("http://correct_serveradress/user.jsp","r")

But how can I send the XML-File?

THX for help!
Markus