irule for X-Forwarded-For

Hi,

I recommend to remove possible existing X-Forwarded-For before inserting a new one :

when HTTP_REQUEST { 
    HTTP::header remove "X-Forwarded-For"
    HTTP::header insert "X-Forwarded-For" [IP::client_addr] 
}

You can also include the code below in an existing irule :

    HTTP::header remove "X-Forwarded-For"
    HTTP::header insert "X-Forwarded-For" [IP::client_addr]