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That looks good. I'd suggest getting/setting the default pool on the VIP though. If a request comes in on one TCP connection and matches the condition in your rule it will go to the internal.google.server pool. If a second request comes in over that same TCP connection and does not match the condition, it will also go to internal.google.server pool--not the default pool configured on the VIP as you may expect.

For more info, check this post: (Click here).

To handle this scenario, you can get the default pool and use it if the request doesn't match the condition:

when CLIENT_ACCEPTED {
   set default_pool [LB::server pool]
}
when HTTP_REQUEST {
   if {[HTTP::uri] contains "lcccat=ecs" } {
      pool internal.google.server
   }
   else {
      pool $default_pool
   }
}

Aaron