iRule to redirect request to another node if HTTP response is 404

Hi Narenda,

You could call HTTP::retry from HTTP_RESPONSE if the status is a 404. I'm not sure about clearing the persistence record though. I wonder if you could call persist none if $retries > 0 and then call persist again with the persistence method you're using.

Here's a rough example to start with:

when CLIENT_ACCEPTED { 
   set retries 0
}
when HTTP_REQUEST {
    Don't retry requests with a payload as we don't
    want to have to collect every payload to retry 404 responses
   switch [HTTP::method] {
      "GET" -
      "HEAD" {
         set request_headers [HTTP::request]
      }
      default {
         set request_headers ""
      }
   }
}
when HTTP_RESPONSE {
   if {$request_headers ne "" && $retries < [active_members [LB::server pool]]}{
      switch [HTTP::status] {
         404 {
            incr retries
            HTTP::retry $request_headers
         }
      }
   }
}

Aaron