wanna record user_agent from specific client ip

oh,yes,hoolio

 

thanks very much

 

I tried to remove else clause,it has errors like this:

 

Jun 2 16:28:28 slot3/tmm err tmm[6309]: 01220001:3: TCL error: cjjtest - can't read "log_ua": no such variable while executing "if { $log_ua == 1 } { log local0. " 174.76.19.40 uses [HTTP::header value User-Agent]" }"

 

 

It means when execute

 

when HTTP_REQUEST {

 

if { $log_ua == 1 } ,bigip can't find log_ua with respect that some other ip ,right?

 

but it doesn't affect the whole process,right?

 

or can u tell me in which condition it will affect the process or performance?