src, src_port and session

[Arnall]

Hello everyone,

Just a simple question, can you confirm that src and src_port are set 
only once per session ?

This seems to be the behaviour when I modify them with set-src and 
set-src-port but I want to be sure.

for example:

http-request set-src req.hdr_ip(True-Client-IP) if whatevercondition==true

For every subsequent requests in the session if i test src in a 
tcp-request command the value of src is True-Client-IP.

Am i right ?

Thanks !