request something over and over

main.go

package main

import (
	"flag"
	"fmt"
	"net/http"
	"os"
	"runtime"
	"sync"
	"time"
)

// limitations
// - only does get request
// - no custom headers
// - http only, no https

var (
	concurent int
	conns     int
	path      string
	wg        sync.WaitGroup
)

func main() {
	flag.IntVar(&conns, "n", 1, "number of total connections")
	flag.IntVar(&concurent, "c", 1, "number of concurrent connections")
	flag.StringVar(&path, "p", "", "endpoint to hit")
	flag.Parse()

	if path == "" {
		fmt.Println("'-p' option is required, see '-help' for options")
		os.Exit(1)
	}

	runtime.GOMAXPROCS(concurent)

	fmt.Printf("args: -n %d -c %d -p %q\n", conns, concurent, path)

	for i := 0; i < conns; i++ {
		wg.Add(1)
		go func(i int, path string) {
			defer func() {
				wg.Done()
			}()

			begin := time.Now()
			r, e := http.Get(path)
			if e != nil {
				panic(e)
			}

			fmt.Printf("%s [response %q] took %v\n", path, r.Status, time.Since(begin))
		}(i, path)
	}

	wg.Wait()
}