HTTP header with winsock

Hello,

I am writing a client and server that will communicate using port 80 to limit firewall interfearence.

I would like to put an HTTP header on each communication in either direction to further protect the communications from firewall interfearence.

What does an HTTP header consist of? and can I just put it in as the beginning of the string that is going to be sent using senddata?

Thanks for any advice.

- Jake