golang/go#11020

gistfile1.go

package main

import (
    "log"
    "net"
    "net/http"
    "time"
)

func main() {
    http.HandleFunc("/", myHandler)

    l, err := net.Listen("tcp", ":12345")
    if err != nil {
        log.Fatal(err)
    }
    go func() {
        log.Fatal(http.Serve(l, nil))
    }()

    cl := http.Client{
        Transport: &http.Transport{},
    }
    req, err := http.NewRequest("GET", "http://localhost:12345/", nil)
    if err != nil {
        log.Fatal(err)
    }

    go func() {
        time.Sleep(100 * time.Millisecond)
        cl.Transport.(*http.Transport).CancelRequest(req)
    }()

    if _, err := cl.Do(req); err != nil {
        log.Fatal(err)
    }
}

func myHandler(w http.ResponseWriter, r *http.Request) {
    time.Sleep(1 * time.Second)
}