HTTP Parameters are very important. First of all you should understand how HTTP Headers are formatted and set. If you don't know it you should read the W3C documentation: http://www.w3.org/Protocols/HTTP/HTRQ_Headers.html .
There are many headers that can be useful for mobile development. Depending on the solution that you will choose, you might not use the HTTP Headers, you might use one, or a combination. There may be other headers that can be useful to specific implementations. We are not going to describe them here.
In addition, IETF Recommendations on TCP over Second (2.5G) and Third (3G) Generation Wireless Networks (RFC 3481) http://www.ietf.org/rfc/rfc3481.txt SHOULD be implemented.