How to log %[hdr_ip(X-Forwarded-For,-1)]

[JWD]

Hi,all

I want to write %[hdr_ip(X-Forwarded-For,-1)] to log, how to do that?

And how to log it with [if] confition? Like set-header below:
    http-request set-header X-Client-IP %[hdr_ip(X-Forwarded-For,-1)] if !{ 
hdr(X-Client-IP) -m found } { hdr(X-Forwarded-For) -m found }
    http-request set-header X-Client-IP %[src] if !{ hdr(X-Client-IP) -m found 
} !{ hdr(X-Forwarded-For) -m found }

Can anyone help me? Thanks.




JWD