Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Benjiman's avatar
Benjiman
Icon for Nimbostratus rankNimbostratus
Sep 19, 2019

URI Redirect with server pool condition

Hi Dev/central,   First of all, thanks for all of your assistance up until this point but I can't find anything to fit the bill on this one.   Description of the problem: We have a single...
application delivery
big-ip
irules
Samir's avatar
Samir
Icon for MVP rankMVP
Sep 20, 2019

Not seen above iRule. But you can try something like this. 

when CLIENT_ACCEPTED {
  if { ([llength [active_members -list poolname]] < 1) and ([HTTP::path] eq "/favicon.ico")  } {
  HTTP::respond 301 Location "https://www.website.com/other/favicon.ico"
         }
}
  • Benjiman's avatar
    Benjiman
    Icon for Nimbostratus rankNimbostratus
    Sep 22, 2019

    Hi Samir,

     

    Thanks for the quick response but unfortunately the iRule doesn't work. I received the following error when attempting to use it.

     

    01070151:3: Rule [/Common/ASID103898_pool_redirect] error: /Common/ASID103898_pool_redirect:3: error: [command is not valid in current event context (CLIENT_ACCEPTED)][HTTP::respond 301 Location "https://www.website.com/other/favicon.ico"]

    /Common/ASID103898_pool_redirect:2: error: [command is not valid in current event context (CLIENT_ACCEPTED)][HTTP::path]

     

    Could I please also clarify that there's an LTM policy that utilises a lot of pools on this VS, the iRule has to be specific to the current session, so that it doesn't impact the other VS connections.

     

    Thanks!