使用Go http重試請求的示例

package main

import (
    "io/ioutil"
    "log"
    "net/http"
    "time"

    "github.com/rafaeljesus/retry-go"
)

var (
    attempts  = 3               //最大重試次數
    sleepTime = time.Second * 2 //重試延遲時間
)

func main() {
    _, err := retry.DoHTTP(func() (*http.Response, error) {
    return makeRequest()
    }, attempts, sleepTime)
    if err != nil {
        log.Print("retry.DoHTTP Failed")
    return
    }

    log.Print("retry.DoHTTP OK")
}

// 發送http請求
func makeRequest() (*http.Response, error) {
    client := http.Client{
    Timeout: 2 * time.Second, // 設置請求超時時間
    }
    req, err := client.Get("https://www.baidu2.com") // 模擬不存在的url請求
    if err != nil {
        log.Printf(err.Error())
        return nil, err
    }

    body, err := ioutil.ReadAll(req.Body)
    if err != nil {
        log.Printf(err.Error())
        return nil, err
    }
    log.Printf("響應數據 %v\\n", string(body))
    defer req.Body.Close()

    res := &http.Response{}
    return res, nil
}