Appending/Including all IP addresses 'en route' within "X-Forwarded-for"

Hi Jimmy,

to consolidate multiple occourences of

X-Forwarded-For

when HTTP_REQUEST {
    if { [set x_forwarded [HTTP::header values "X-Forwarded-For"]] ne "" } then {
        HTTP::header remove "X-Forwarded-For" 
        HTTP::header insert "X-Forwarded-For" "[join $x_forwarded ", "], [getfield [IP::client_addr] "%" 1]"
    } else {
        HTTP::header insert "X-Forwarded-For" "[getfield [IP::client_addr] "%" 1]"
    }
}

The iRule will collect any existing

X-Forwarded-For

X-Forwarded-For

Incomming HTTP request headers

GET / HTTP/1.1  
Host: site.domain.de  
... 
X-Forwarded-For: 1.1.1.1  
X-Forwarded-For: 2.2.2.2, 3.3.3.3
X-Forwarded-For: 4.4.4.4 

Outgoing HTTP request headers

GET / HTTP/1.1  
Host: site.domain.de  
... 
X-Forwarded-For: 1.1.1.1, 2.2.2.2, 3.3.3.3, 4.4.4.4, 5.5.5.5

Note: Make sure to disable the automatic X-Forwarded-For insert option in your HTTP profile. The insert will be already handled by this iRule...

Cheers, Kai