F5-iRules to Log HTTP Error Responses-5XX

when HTTP_REQUEST {

    set hostvar [HTTP::host]

    set urivar [HTTP::uri]

    set ipvar [IP::client_addr] 

    }

    when HTTP_RESPONSE {

            if { [HTTP::status] starts_with "5" } {

                    log local0. "$ipvar requested $hostvar $urivar and received a [HTTP::status] from [IP::server_addr]" }

    }     

or

when HTTP_REQUEST {

set hostvar [HTTP::host]

set urivar [HTTP::uri]

set ipvar [IP::client_addr] }

when HTTP_RESPONSE {

if { [HTTP::status] eq 500 } {

log local0. “$ipvar requested $hostvar $urivar and received a 500 from [IP::server_addr]” }}