slingBreak.go

package main

import (
	"fmt"
	"sync"

	"github.com/dghubble/sling"
)

func main() {
	var wg sync.WaitGroup

	client := sling.New().Base("http://localhost:3000")

	for i := 0; i < 5; i++ {
		wg.Add(1)
		go Call(&wg, client, "/booking/step/1")
	}

	fmt.Println("Waiting to finish")
	wg.Wait()
	fmt.Println("Waiting to finish")
}

// Call will make the calls
func Call(wg *sync.WaitGroup, cl *sling.Sling, url string) {
	defer wg.Done()
	data := struct {
		CategoryID string `json:categoryId`
	}{
		"1",
	}
	resp, err := cl.Post(url).BodyJSON(data).ReceiveSuccess(nil)

	if err != nil {
		panic(err)
	}

	fmt.Printf("And the RESP : %d", resp.StatusCode)
}