Parallel request to the list of URLs

Example of a program demonstrating simultaneous sending of HTTP requests to a set of websites. First, an array of links is formed, then a separate goroutine is launched for each link, which outputs the start and end status of the request. After launching all goroutines, the main thread outputs a message, waits for a short pause, and then terminates.

The program output may look like this:

package main

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

func main() {
    links := []string{
        "https://www.lamoda.ru",
        "https://www.yandex.ru",
        "https://www.mail.ru",
        "https://www.google.com",
    }

    for _, link := range links {
        go func(l string) {
            fmt.Printf("Fetching %s...\n", l)

            err := getURL(l)
            if err != nil {
                fmt.Printf("Error fetching %s: %v\n", l, err)
                return
            }

            fmt.Printf("Fetched %s\n", l)
        }(link)
    }

    fmt.Println("All requests launched!")
    time.Sleep(400 * time.Millisecond)
    fmt.Println("Program finished.")
}

func getURL(address string) error {
    // Detailed implementation is omitted
    _, err := http.Get(address)
    return err
}