WAP's session layer is the Wireless Session Protocol (WSP). WSP is the equivalent to HTTP for WAP browsers but it is not similar to HTTP. WAP involves browsers and servers just like the internet technology, but HTTP was not a practical choice for WAP because of its relative inefficiency on the wire. WSP conserves precious bandwidth on wireless links; in particular, WSP works with relatively compact binary data where HTTP works mainly with text data.
These three protocols uses in WAP:
Wireless Transaction Protocol (WTP)
Wireless Transaction Layer Security (WTLS)
Wireless Datagram Protocol (WDP)