XFF Universal Persistence iRule
Problem this snippet solves: Simple iRule to read the XFF header on an incoming HTTP Request and use a Universal Persistence ID.
Orginal iRule found to have an issue with multiple IP addresses in th...
Updated Jun 06, 2023
Version 2.0
Andy_McGrath
Cumulonimbus
Cumulonimbus
Andy_McGrathCumulonimbus
CumulonimbusYann, 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.