package main

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

var (
    URLOK   string = "https://google.com"
    URLSLOW string = "http://slowwly.robertomurray.co.uk/delay/10000/url/" + URLOK
)

func goSlow(slowURL string, wg *sync.WaitGroup) {
    fmt.Println("in go slow")
    r, _ := http.Get(slowURL)
    defer r.Body.Close()
    defer fmt.Println("GO SLOW", "DONE")
    defer wg.Done()

}

func goFast(URL string, wg *sync.WaitGroup) {
    fmt.Println("in go fast")
    r, _ := http.Get(URL)
    defer r.Body.Close()
    defer fmt.Println("GO FAST", "DONE")
    defer wg.Done()
}

func justGo(wg *sync.WaitGroup) {
    fmt.Println("in just Go")
    r, _ := http.Get("https://bing.com")
    defer r.Body.Close()
    defer fmt.Println("JUST GO", "DONE")
    defer wg.Done()
}
func main() {
    var wg sync.WaitGroup
    wg.Add(3)

    go goSlow(URLSLOW, &wg)
    go justGo(&wg)
    go goFast(URLOK, &wg)

    wg.Wait()
}


//Outputs:

in go fast
in go slow
in just Go
GO FAST DONE
JUST GO DONE
GO SLOW DONE