c# - 服务器违反了协议(protocol)。 C# 中的 Section=ResponseStatusLine

Question

我花了一整天的时间试图解决这个问题。我有一个自定义网络服务器，Chrome 或 POSTman ReST 客户端对它的请求工作正常。只要我在 c# 中使用 webclient 或 httpwebrequest，我就会得到:服务器违反了协议(protocol)。尝试将 zip 文件传输到客户端时，Section=ResponseStatusLine。

我试过:

public static bool SetAllowUnsafeHeaderParsing20()
{
    //Get the assembly that contains the internal class
    Assembly aNetAssembly = Assembly.GetAssembly(typeof(System.Net.Configuration.SettingsSection));
    if (aNetAssembly != null)
    {
        //Use the assembly in order to get the internal type for the internal class
        Type aSettingsType = aNetAssembly.GetType("System.Net.Configuration.SettingsSectionInternal");
        if (aSettingsType != null)
        {
            //Use the internal static property to get an instance of the internal settings class.
            //If the static instance isn't created allready the property will create it for us.
            object anInstance = aSettingsType.InvokeMember("Section", BindingFlags.Static | BindingFlags.GetProperty | BindingFlags.NonPublic, null, null, new object[] { });
            if (anInstance != null)
            {
                //Locate the private bool field that tells the framework is unsafe header parsing should be allowed or not
                FieldInfo aUseUnsafeHeaderParsing = aSettingsType.GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic | BindingFlags.Instance);
                if (aUseUnsafeHeaderParsing != null)
                {
                    aUseUnsafeHeaderParsing.SetValue(anInstance, true);
                    return true;
                }
            }
        }
    }
    return false;
}

和

<system.net>
  <settings>
    <httpWebRequest useUnsafeHeaderParsing="true" />
  </settings>
</system.net>

在 app.config 中。

我也试过 keep-alive=false 并且也弄乱了标题/

这是 web 请求，它在 client2Downloadfile 调用上失败:

private void sendManifest()
{

    Uri remoteuri = new Uri(Properties.Settings.Default.masterurl);

    SetAllowUnsafeHeaderParsing20();
    using (WebClient client = new WebClient())
    {
        NameValueCollection reqparm = new NameValueCollection();
        reqparm.Add("application", "TestApp");
        reqparm.Add("manifest", manifest);
        try
        {
            byte[] responsebytes = client.UploadValues(Properties.Settings.Default.masterurl, "POST", reqparm);
            string responsebody = Encoding.UTF8.GetString(responsebytes);
            if (responsebody != "")
            {
                using (WebClient client2 = new WebClient())
                {
                    client2.DownloadFile(Properties.Settings.Default.masterurl + "//" + responsebody + "transfer.zip", "c:\\temp.zip");
                }
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
    }
}

可以在以下位置看到网络服务器响应:

http://gplus2.net:9532/97e456f0-9b57-4315-b03d-40a67f76d440/transfer.zip

非常感谢您提供任何帮助，因为我已经完全没有想法了。它显然是格式错误的服务器 header ，但我已将其保持在最低限度。

Answer 1

我遇到了同样的问题，我用下面的方法解决了。我创建了一个覆盖 GetWebRequestMethod 的自定义 Web 客户端。

  class CustomWebClient : WebClient
{
    /// <summary>
    /// Returns a <see cref="T:System.Net.WebRequest" /> object for the specified resource.
    /// </summary>
    /// <param name="address">A <see cref="T:System.Uri" /> that identifies the resource to request.</param>
    /// <returns>
    /// A new <see cref="T:System.Net.WebRequest" /> object for the specified resource.
    /// </returns>
    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);
        if (request is HttpWebRequest)
        {
            (request as HttpWebRequest).KeepAlive = false;
        }
        return request;
    }
}

然后我像这样用正常的方式发出请求

using (CustomWebClient client = new CustomWebClient())
        {
            client.Headers[HttpRequestHeader.Authorization] = "Basic " + base64String;
            responseData = client.DownloadData(baseUri);
        }