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目前正在尝试创建一个分段上传请求来上传一个 png 以及一些额外的正文参数。服务器正在返回响应：

请求正文不包含指定的字节数。得到 142,827，预期 146,836

所以很明显，计算出了点问题。我一生都无法弄清楚如何实际手动计算正文的内容长度并为请求正确归档。请参阅下面我发送请求的代码：

func signUp(email, username, password, profilePath string) account {
    session := createClient()

    capToke := captchaToken(session)

    solved := solveCaptcha(capToke, "example.com")

    if solved == failed {
        panic("Solve Failed")
    }
    extraParams := map[string]string{
        "Username":             username,
        "Age":                  string(random(18, 21)),
        "Gender":               "1",
        "EmailAddress":         email,
        "Password":             password,
        "ConfirmPassword":      password,
        "g-recaptcha-response": solved,
        "Recaptcha":            "",
        "ReceiveNewsletter":    "false",
    }

    req, err := makeFileUploadRequest("https://example.com", extraParams, "ProfileImage", profilePath)
    if err != nil {
        panic(err)
    }

    req.Header.Set("Host", "example.com")
    req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0")
    req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
    req.Header.Set("Accept-Language", "en-US,en;q=0.5")
    req.Header.Set("Accept-Encoding", "gzip, deflate, br")
    req.Header.Set("Referer", "https://example.com")
    req.Header.Set("Connection", "keep-alive")
    req.Header.Set("Upgrade-Insecure-Requests", "1")

    client := createClient()
    resp, err := client.Do(req)
    defer resp.Body.Close()
    if err != nil {
        panic(err)
    } else {
        var bodyContent []byte
        fmt.Println(resp.StatusCode)
        fmt.Println(resp.Header)
        resp.Body.Read(bodyContent)
        resp.Body.Close()
        fmt.Println(bodyContent)
    }
    var acc account

    acc.email = email
    acc.password = password
    acc.username = username

    return acc
}

func makeFileUploadRequest(uri string, params map[string]string, paramName, path string) (*http.Request, error) {
    file, err := os.Open(path)
    if err != nil {
        return nil, err
    }
    fileContents, err := ioutil.ReadAll(file)
    if err != nil {
        return nil, err
    }
    fi, err := file.Stat()
    if err != nil {
        return nil, err
    }
    file.Close()

    body := new(bytes.Buffer)
    writer := multipart.NewWriter(body)

    for key, val := range params {
        _ = writer.WriteField(key, val)
    }
    err = writer.Close()
    if err != nil {
        return nil, err
    }

    part, err := writer.CreateFormFile(paramName, fi.Name())
    if err != nil {
        return nil, err
    }
    ht, _ := http.NewRequest("POST", uri, body)
    ht.Header.Set("Content-Type", writer.FormDataContentType())
    writer.Close()
    return ht, err
}
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1 回答 1

3

错误在以下几行：

ht, _ := http.NewRequest("POST", uri, body)
ht.Header.Set("Content-Type", writer.FormDataContentType())
writer.Close()

对 NewRequest 的调用识别出正文是 bytes.Buffer 并使用缓冲区的当前大小设置内容长度标头。

最终的多部分边界在调用 writer.Close() 时写入请求正文。此边界不包括在先前在对 NewRequest 的调用中设置的内容长度中。

要解决此问题，请在创建请求之前关闭编写器：

writer.Close()
ht, _ := http.NewRequest("POST", uri, body)
ht.Header.Set("Content-Type", writer.FormDataContentType())
于 2017-11-23T18:53:12.040 回答