Return Http Response and then Perform other tasks

controller.go

package main

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

func ping(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(200)
}

func search(w http.ResponseWriter, r *http.Request) {
	wg := &sync.WaitGroup{}
	go writer(wg)
	w.Write([]byte("hello"))
	wg.Wait()
}

func writer(wg *sync.WaitGroup) {
	wg.Add(1)
	for i := 0; i < 10; i++ {
		fmt.Print("olaylar\n")
		time.Sleep(1 * time.Second)
	}
	wg.Done()
}