irule for x forwarder

Hi,

You can also use switch or a datagroup :

using SWITCH :

    when HTTP_REQUEST {
        switch [HTTP::host] {
            "name1.apps.abc.com" - 
            "namex.apps.abc.com" {
                 HTTP::header remove "X-Forwarded-For"
                 or do nothing
            }
            default {
                HTTP::header insert "X-Forwarded-For" [getfield [IP::client_addr] "%" 1]
            }
        }
    }

Using DATAGROUPS

    when HTTP_REQUEST {
        if { [class match [HTTP::host] contains X_FORWARD_HOST] } {
            HTTP::header insert "X-Forwarded-For" [getfield [IP::client_addr] "%" 1]
        } else {
             HTTP::header remove "X-Forwarded-For"
             or do nothing
        }
    }

Once you know the logic of those commands, you can choose the way you want to manage your exceptions.