如何在Golang中使用摘要身份验证执行HTTP POST？

import (
    "bytes"
    "crypto/md5"
    "encoding/base64"
    "fmt"
    "net/http"
)

client := &http.Client{}

url := "http://example.com/api"
body := []byte("request body")
req, err := http.NewRequest("POST", url, bytes.NewBuffer(body))
if err != nil {
    fmt.Println("Error creating request:", err)
    return
}

username := "your_username"
password := "your_password"
auth := username + ":" + password
hash := md5.Sum([]byte(auth))
digest := base64.StdEncoding.EncodeToString(hash[:])
req.Header.Add("Authorization", "Digest "+digest)

resp, err := client.Do(req)
if err != nil {
    fmt.Println("Error sending request:", err)
    return
}
defer resp.Body.Close()

// 处理响应
// ...