尝试更新 Twitter 状态时期望失败

我似乎无法弄清楚这一点。无论我做什么，我都会收到“417 Expectation failed”错误。我看过的所有地方都说我需要删除 HttpWebRequest 的 Expect 标头。设置静态属性ServicePointManager.Expect100Continue = false或 Web 请求上的实例属性request.ServicePoint.Expect100Continue = false永远不要摆脱标题。我必须手动将其设置为 null 才能将其删除。

不管怎样，我仍然收到 417 错误。我缺少什么？

private static readonly MessageReceivingEndpoint UpdateStatusEndpoint 
       = new MessageReceivingEndpoint("http://twitter.com/statuses/update.xml", HttpDeliveryMethods.PostRequest);

public static XDocument UpdateStatus(ConsumerBase twitter, string accessToken, string message)
{
    var data = new Dictionary<string, string>();
    data.Add("status", message);
    ServicePointManager.Expect100Continue = false; //Doesn't work
    HttpWebRequest request = twitter.PrepareAuthorizedRequest(UpdateStatusEndpoint, accessToken, data);

    request.ServicePoint.Expect100Continue = false; //setting here doesn't work either

    //request.Expect is still set at this point unless I explicitly set it to null.

    request.Expect = null;
    var response = twitter.Channel.WebRequestHandler.GetResponse(request); //Throws exception
    return XDocument.Load(XmlReader.Create(response.GetResponseReader()));
}

DotNetOpenAuth 不直接设置或支持 except100Continue。如果 Channel 类中有一个属性那就太好了。

在调用“准备授权请求”之前添加以下内容：

    ((HttpWebRequest)WebRequest.Create
(UpdateStatusEndpoint.Location)).ServicePoint.Expect100Continue = false;

Expect100Continue 根据调用的 URL 设置。所以你可以在创建连接之前设置它。您甚至可以在配置文件中全局设置它。

  <system.net>
    <settings>
      <servicePointManager expect100Continue="false" />
    </settings>
  </system.net>