XFF Universal Persistence iRule

Yann, You are correct for most headers where multiple headers exist with the same name however the XFF header gets appended, i.e. Format is;

X-Forwarded-For: client, proxy1, proxy2

So there should only ever be a single X-Forwarded-For header within a HTTP request with the first IP address being closest to the original. I could do the following:

[getfield [HTTP::header X-Forwarded-For] "," 1]

However I test a lot of code directly in TCL so the getfield commend is not valid but this is just down to personal preference.