Because I needed it in my situation - here's a quick patch to allow changing of the "x-forwarded-for" header by using a suboption to "option forwardfor". Suboption "header XYZ" will set the header from "x-forwarded-for" to "XYZ". Default is still "x-forwarded-for" if the header value isn't defined. Also the suboption 'except a.b.c.d/z' still works on the same line. So it's now: option forwardfor [except a.b.c.d[/z]] [header XYZ]