在Go语言中如何解决并发网络请求的请求连接池和连接复用问题？

package main

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

var pool = &sync.Pool{
    New: func() interface{} {
        return createConnection() // 创建一个新的网络连接
    },
}

func createConnection() *http.Client {
    return &http.Client{}
}

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

    var wg sync.WaitGroup
    wg.Add(len(urls))

    for _, url := range urls {
        go func(url string) {
            defer wg.Done()

            client := pool.Get().(*http.Client)
            defer pool.Put(client)

            resp, err := client.Get(url)
            if err != nil {
                fmt.Printf("Error fetching %s: %s
", url, err)
                return
            }
            defer resp.Body.Close()

            fmt.Printf("%s fetched successfully!
", url)
        }(url)
    }

    wg.Wait()
}