X-Forwarded-For middleware fo Go

Package xff is a net/http middleware/handler to parse Forwarded HTTP Extension in Golang.

Example usage

Install xff:

go get github.com/sebest/xff

Edit server.go:

package main
import (
"net/http""github.com/sebest/xff"
)
funcmain() {
handler:=http.HandlerFunc(func(w http.ResponseWriter, r*http.Request) {
w.Write([]byte("hello from "+r.RemoteAddr+"\n"))
})
xffmw, _:=xff.Default()
http.ListenAndServe(":8080", xffmw.Handler(handler))
}

Then run your server:

go run server.go

The server now runs on localhost:8080:

$ curl -D - -H 'X-Forwarded-For: 42.42.42.42' http://localhost:8080/
HTTP/1.1 200 OK
Date: Fri, 20 Feb 2015 20:03:02 GMT
Content-Length: 29
Content-Type: text/plain; charset=utf-8
hello from 42.42.42.42:52661