A potential way to kill all connections in a proxy server

killproxy.go

package main

import (
	"http"
	"net"
	"os"
	"url"
)

var reverse = http.NewSingleHostReverseProxy(&url.URL{Scheme: "http", Host: "google.com"})
var cancel = make(chan bool)

func proxy(w http.ResponseWriter, r *http.Request) {
	var proxyconn net.Conn
	dial := func(network, addr string) (c net.Conn, err os.Error) {
		c, err = net.Dial(network, addr)
		proxyconn = c
		return
	}

	t := &http.Transport{Dial: dial}
	p := &http.ReverseProxy{Transport: t, Director: reverse.Director}

	servedone := make(chan bool)
	go func() {
		p.ServeHTTP(w, r)
		close(servedone)
	}()

	select {
	case <-servedone:
	case <-cancel:
		// close the proxy connection
		proxyconn.Close()
		// close the client connection
		if h, ok := w.(http.Hijacker); ok {
			if conn, _, err := h.Hijack(); err == nil {
				conn.Close()
			}
		}
	}
}

func main() {
	http.HandleFunc("/", proxy)
}