concurrency-test-http-client.go

package main

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

func main() {
    url := "http://localhost:8081"

    maxConnection := make(chan bool,2000)
    wg := &sync.WaitGroup{}

    count := 0
    start := time.Now()
    for maxRequest := 0; maxRequest < 2000; maxRequest ++{
        wg.Add(1)
        maxConnection <- true
        go func() {
            defer wg.Done()
            resp, err := http.Get(url)
            if err != nil {
                return
            }
            defer resp.Body.Close()
            count++
            <-maxConnection
        }()
    }
    wg.Wait()
    end := time.Now()
    log.Printf("%d count\n", count)
    log.Printf("%f sec\n",(end.Sub(start)).Seconds())
}