Expression Persistence

Sorry to be confusing.

 

There are three different ways to solve your problem: a rule, a pool with a persist expression (universal persistence), a pool with a select expression. Because you have the IP address in the URI the select expression is the most efficient. However, I included a persist timeout for the persist expression in the my code example. This timeout is unnecessary because a select expression is not persistence and therefore does not create persistence sessions that need to be timed out. You can turn on one of the persistence modes at the same time as using a select expression but traffic would continue to be directed by the select expression.

 

 

Another important point, the third argument in the findstr function is the offset. Therefore, you need to use a 6 to jump over "bigip=":

 

node(findstr(http_uri, "bigip=", 6) + ":80")

 

 

Read the Reference Guide iRules section for more details.