F5 iRule Task

Hello,

Perhaps this example will cover your needs:

when HTTP_REQUEST {
    set uri [HTTP::uri]
    if { [HTTP::path] starts_with "/accounting" } {
        pool accounting_servers
    }
    elseif { [info exists goto_legacy] } {
        unset goto_legacy
        pool legacy_servers
    } else {
        pool responsive_servers
    }
}
when LB_SELECTED {
    log local0. "URI: $uri | Selected pool: [LB::server pool]"
}
when HTTP_RESPONSE {
    if { [HTTP::status] eq 404 } {
        if { [LB::server pool] ends_with "responsive_servers" } {
            set goto_legacy 1
            HTTP::respond 302 -version auto noserver Location $uri X-Retry-Response 404
        }
    }
}

It flags a variable on failed attempt to responsive servers and then redirect to new attempt on legacy servers using the same connection.

Maybe that helps but I don't know it's the best thing to do. (But I can't think of another 😕 )

Please, tell me if it solves or there are a better solution.

Kind regards.