Need help with iRule error log message

Hi Sahir,

the problem can be found in this code block...

            if { [findstr [HTTP::uri] "jsessionid" 11 "!"] != ""} {
                pool ets_80-pool member [session lookup uie [findstr [HTTP::uri] "jsessionid" 11 "!"] ]
               log local0. "jsessionID [findstr [HTTP::uri] "jsessionid" 11 "!"] sent to [session lookup uie [findstr [HTTP::uri] "jsessionid" 11 "!"] ]"
            } else {
                pool ets_80-pool
               log local0. "No jsession ID, local balancing the connection..."
            }

If the client sends an [HTTP::uri] containing the string jsessionid, you'll will use a substring of it to find an matching [session lookup uie] record. But then you don't verify if the session query has deliverd any values before proceeding with the member node selection. I highly doubt this code has ever worked stable...?

An improved code would look like this...

when HTTP_RESPONSE {
    if { [HTTP::cookie exists "JSESSIONID"] } {
        set trimID [lindex [split  [HTTP::cookie "JSESSIONID"] "!" ] 0 ]
        if { [session lookup uie $trimID] equals "" } {
            session add uie $trimID [IP::server_addr] 1800
           log local0. "added server entry [session lookup uie $trimID] for jsessionID $trimID "
        } else {
           log local0. "existing server entry [session lookup uie $trimID] for jsessionID $trimID"
        }
    }
}

when HTTP_REQUEST {
    if { [active_members et-pool] == 0 } {
        HTTP::redirect "http://[HTTP::header "X-Forwarded-Host"]/unavailable/etServices.html"
    } else {
        if { [HTTP::header exists "X-Forwarded-Host"] } {
            HTTP::header replace "Host" [HTTP::header "X-Forwarded-Host"]
        }
        if { [HTTP::cookie exists "em-et"] } {
           log local0. "Persisting by cookie em-et, contents are [HTTP::cookie "em-et"]"
        } else {
            set pool_member [session lookup uie [findstr [HTTP::uri] "jsessionid" 11 "!"]]
            if { $pool_member ne "" } {
                pool ets_80-pool member $pool_member
               log local0. "jsessionID [findstr [HTTP::uri] "jsessionid" 11 "!"] sent to [session lookup uie [findstr [HTTP::uri] "jsessionid" 11 "!"] ]"
            } else {
                pool ets_80-pool
               log local0. "No jsession ID, local balancing the connection..."
            }
        }
    }
}

Note: You may apply the improved code before updating the device...

Cheers, Kai