c# - 通过 HTTPWebRequest 发送文件并在网络服务器上从 $_FILES 接收文件

Question

我的 .NET 应用程序通过 HttpWebRequest 将一个简单的文本文件发送到 Web 服务器。但是在网络服务器端，我总是得到一个空的 $_FILES 数组。

我阅读了所有这些问题和文章:

• POSTING MULTIPART/FORM-DATA USING .NET WEBREQUEST
• Upload files with HTTPWebrequest (multipart/form-data)
• How to recieve POST data sent using “application/octet-stream” in PHP?
• and PHP manual of course: Handling file uploads

测试代码如下:

public static void UploadFile()
{
    var boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");

    var httpRequest = (HttpWebRequest)WebRequest.Create(@"https://test.com/upload.php");
    httpRequest.Credentials = CredentialCache.DefaultNetworkCredentials;
    httpRequest.AllowAutoRedirect = true;
    httpRequest.MaximumAutomaticRedirections = 1;
    httpRequest.Method = "POST";
    httpRequest.ContentType = "multipart/form-data; boundary=" + boundary;
    httpRequest.KeepAlive = true;

    using (var requestStream = httpRequest.GetRequestStream())
    {
        var data = Encoding.UTF8.GetBytes("--" + boundary + "\r\n\r\n");
        requestStream.Write(data, 0, data.Length);

        data = Encoding.UTF8.GetBytes("Content-Disposition: form-data; name=\"MAX_FILE_SIZE\"\r\n\r\n");
        requestStream.Write(data, 0, data.Length);

        data = Encoding.UTF8.GetBytes("1048576"); // 1Mb
        requestStream.Write(data, 0, data.Length);

        data = Encoding.UTF8.GetBytes("--" + boundary + "\r\n");
        requestStream.Write(data, 0, data.Length);

        data = Encoding.UTF8.GetBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\"upload.txt\"\r\n");
        requestStream.Write(data, 0, data.Length);

        data = Encoding.UTF8.GetBytes("Content-Type: application/octet-stream\r\n\r\n");
        requestStream.Write(data, 0, data.Length);

        data = File.ReadAllBytes(@"D:\upload.txt");
        requestStream.Write(data, 0, data.Length);

        data = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--");
        requestStream.Write(data, 0, data.Length);
    }

    using (var response = (HttpWebResponse)httpRequest.GetResponse())
    using (var sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
        Console.WriteLine(sr.ReadToEnd());
}

/upload.php:

exit (var_dump($_FILES));

在控制台中，输出始终为:array(0){}
请帮忙。

Answer 1

根据评论写出答案。

Fiddler让您在发出请求和检索响应时检查通过线路发送的数据。它是一个代理并且是免费的(目前):-)

当遇到这样的问题时，必须手动让它工作，然后尝试以编程方式重新创建请求并检查请求以查看它是否以正确的方式构建。