Tracking session in soap header?

(didn't see your other post)

This thread has response event logic similar to what you'd need to add to the request bit we've already worked out.

http://devcentral.f5.com/Default.aspx?tabid=53&view=topic&forumid=5&postid=13876 (Click here

So something like this, replacing/adjusting the findstr command in HTTP_RESPONSE to match your situation:

when HTTP_REQUEST {
   collect the payload containing the POST data
  HTTP::collect [HTTP::header Content-Length]
}
when HTTP_REQUEST_DATA {
   persist on data from 59th character following 'xmlns:soapenc=' up to "<"
   follow existing persistence record or create a new one
  persist uie [findstr [HTTP::payload] xmlns:soapenc= 58 <]
  log local0. "Request SessionID is: >[findstr [HTTP::payload] xmlns:soapenc= 58 <]<"
}
when HTTP_RESPONSE {
  set SessionId [findstr [HTTP::header SOAPheader] "xmlns:soapenc=" 58 <]
  log local0. "Response SessionId is: >$SessionId<"
  if { $SessionId != "" }{ persist add uie $SessionId }
}