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Benjiman's avatar
Benjiman
Icon for Nimbostratus rankNimbostratus
Sep 20, 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 VS, which load balances a number of web applications via the LTM policy. We are using cookie persistence which is breaking one of our applications when chrome automatically requests /favicon.ico from the root directory when a new tab is opened. The larger problem will be resolved in work coming up but I'm looking for a quick fix as it's affecting users.

 

Essentially what I'm trying to achieve with an iRule is to redirect /favicon.ico to /other/favicon.ico, only when it's requested to a particular pool which I believe would look something like this, however it's not working.

 

when HTTP_REQUEST {

if { [[LB::server name] equals poolname] }{

  if { [string tolower [HTTP::host]] eq "www.website.com" and [HTTP::path] eq "/favicon.ico" } {

  HTTP::respond 301 Location "https://www.website.com/other/favicon.ico"

    }

}

 

Any help is greatly appreciated.

 

- Benjiman

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!