Forum Discussion
What_Lies_Bene1
Nov 27, 2012Cirrostratus
That would depend on the application I guess. The Wikipedia page: http://en.wikipedia.org/wiki/X-Forwarded-For states this: "X-Forwarded-For logging is supported by many web servers including Apache. Microsoft IIS 6.0 & 7.0 can use a third party ISAPI filter to accomplish this task. IIS 7.0 can also use a HTTP Module for this filtering."
I know nginx supports XFF too: http://wiki.nginx.org/HttpRealipModule. There's some information on using the XFF value within PHP here as well: https://devcentral.f5.com/weblogs/macvittie/archive/2008/06/02/3323.aspx.
Obviously you'll be using the XFF for more than logging but all this support suggests it's not too difficult.