Go语言中如何处理网络编程中的并发问题？

package main

import (
    "fmt"
    "net/Http"
)

func handleRequest(url string, ch chan string) {
    resp, err := http.Get(url)
    if err != nil {
        ch <- fmt.Sprintln("Error:", err)
        return
    }
    ch <- fmt.Sprintf("Response from %s: %s", url, resp.Status)
}

func main() {
    urls := []string{
        "https://www.google.com",
        "https://www.GitHub.com",
        "https://www.baidu.com",
    }

    ch := make(chan string)

    for _, url := range urls {
        go handleRequest(url, ch)
    }

    for i := 0; i < len(urls); i++ {
        fmt.Println(<-ch)
    }
}

package main

import (
    "fmt"
    "sync"
    "time"
)

func worker(id int, wg *sync.WaitGroup) {
    defer wg.Done()

    fmt.Printf("Worker %d started
", id)
    time.Sleep(time.Second)
    fmt.Printf("Worker %d finished
", id)
}

func main() {
    var wg sync.WaitGroup

    for i := 0; i < 5; i++ {
        wg.Add(1)
        go worker(i, &wg)
    }

    wg.Wait()
    fmt.Println("All workers finished")
}

package main

import (
    "fmt"
    "sync"
)

type Counter struct {
    count int
    mu    sync.Mutex
}

func (c *Counter) Increment() {
    c.mu.Lock()
    defer c.mu.Unlock()

    c.count++
}

func (c *Counter) GetCount() int {
    c.mu.Lock()
    defer c.mu.Unlock()

    return c.count
}

func main() {
    var counter Counter

    var wg sync.WaitGroup

    for i := 0; i < 1000; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()

            counter.Increment()
        }()
    }

    wg.Wait()

    fmt.Println("Count:", counter.GetCount())
}