net/http: http: ContentLength=222 with Body length 0

Question

I\'m trying to retry a request if there is a connection/proxy error. For some reasons I keep getting this error which doesn\'t seem to recover regardless the attepts to retry th

Answer 1

I found a way to do this without re-creating the request every time. here's a sample code, which is a very slight modification of @Cerise Limón and is similar to @Rambo's code in that it creates the request only once:

func Post(URL string, data *bytes.Buffer, cl *http.Client) ([]byte, error) {
    var err error

    req, err := http.NewRequest("POST", URL, ioutil.NopCloser(data))
    if err != nil {
        log.Errorf("Unable to create the request: %v", err)
        return nil, err
    }
    req.Header.Set("User-Agent", ua)

    for i := 0; i < 10; i++ {
        rsp, err := cl.Do(req)
        if err == nil && rsp.StatusCode == 200 {
            defer rsp.Body.Close()
            b, err := ioutil.ReadAll(rsp.Body)
            if err != nil {
                fmt.Printf("Error: %v", err)
                return nil, err
            }
            return b, nil
        }

        log.Errorf("Proxy is slow or down %v", err)
        time.Sleep(1 * time.Second)
    }
    return nil, fmt.Errorf("after 10 tries error: %v", err)
}

func main() {
    client := http.Client{}
    data := []byte{0, 1, 2, 3, 4}
    Post("http://server/my/api/resource/", bytes.NewBuffer(data), &client)
}