session soap irule persistency

I tried this:

when HTTP_REQUEST { HTTP::collect [HTTP::header Content-Length] } when HTTP_REQUEST_DATA { set my_uri [HTTP::uri] set my_sessionId [findstr[HTTP::payload] "sessionId=" 1 ","] log local0. "found request sessionID: $my_sessionId in SOAP call: $my_uri" if { $my_sessionId != "" } { persist uie $my_sessionId } } when HTTP_RESPONSE { set my_sessionId [findstr[HTTP::payload] "sessionId=" 1 ","] log local0. "found response sessionID: $my_sessionId in SOAP response from: [LB::server addr]" if { $my_sessionId != "" } { persist add uie $my_sessionId } }