cocurrency http client example for golang

cocurrency_request.go

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	"github.com/gojektech/heimdall/httpclient"
)

func main() {
	// Create a new HTTP client with a default timeout
	timeout := 5000 * time.Millisecond
	client := httpclient.NewClient(httpclient.WithHTTPTimeout(timeout))

	headers := http.Header{}
	headers.Set("Authorization", "Bearer xxx")
	headers.Set("Content-Type", "application/json")

	payload := `
	{}
	`
	url := "https://localhost/api/users"

	var mu sync.WaitGroup
	st := time.Now()

	var syncTotal int64

	for i := 0; i < 40; i++ {
		go func() {
			mu.Add(1)
			defer mu.Done()

			sst := time.Now()
			// Use the clients GET method to create and execute the request
			res, err := client.Post(url, strings.NewReader(payload), headers)
			if err != nil {
				panic(err)
			}
			defer res.Body.Close()

			_, err = ioutil.ReadAll(res.Body)
			if err != nil {
				panic(err)
			}
			fmt.Println(res.Status)
			curDuration := time.Now().Sub(sst).Nanoseconds()
			atomic.AddInt64(&syncTotal, curDuration)
		}()
	}
	mu.Wait()

	fmt.Println("total: ", time.Now().Sub(st).Nanoseconds())
	fmt.Println("syncTotal: ", atomic.LoadInt64(&syncTotal))

}