C# DotNetOpenAuth Twitter RequestUserAuthorization协议异常403错误

我正处于尝试使用DotNetOpenAuth与Twitter通信的第一阶段。 无论何时调用此方法，我都会收到以下错误：

发生原异常 远程服务器返回错误：（403）禁止

public string SendConsumerAuthentication()
{
    ServiceProviderDescription serviceProvider = GetServiceDescription();

    string applicationKey = settingsManager.GetApplicationKey(className);
    string applicationSecret = settingsManager.GetApplicationSecret(className);

    // decouple this in future
    InMemoryTokenManager inMemoryTokenManager = new InMemoryTokenManager(applicationKey, applicationSecret);

    var consumer = new DesktopConsumer(serviceProvider, inMemoryTokenManager);
    string uri = string.Empty;
    string requestToken = string.Empty;

    var requestArgs = new Dictionary<string, string> { 
        //need to pass this as extra, but leave the value blank
        { "oauth_token", string.Empty} 
    };

    //request access
    try
    {                
        uri = consumer.RequestUserAuthorization(requestArgs, null, out requestToken).AbsoluteUri;
    }
    catch (Exception)
    {
        uri = null;                
    }

    return uri;
}

公共字符串SendConsumerAuthentication（）
{
ServiceProviderDescription serviceProvider=GetServiceDescription（）；
string applicationKey=settingsManager.GetApplicationKey（类名）；
string applicationSecret=settingsManager.GetApplicationSecret（类名）；
//在将来将其解耦
InMemoryTokenManager InMemoryTokenManager=新建InMemoryTokenManager（应用程序密钥，应用程序加密）；
var consumer=新的桌面用户（serviceProvider，inMemoryTokenManager）；
stringuri=string.Empty；
string requestToken=string.Empty；
var requestArgs=新字典{
//需要将其作为额外值传递，但将值留空
{“oauth_令牌”，string.Empty}
};
//请求访问
尝试
{                
uri=consumer.RequestUserAuthorization（requestArgs，null，out-requestToken）；
}
捕获（例外）
{
uri=null；
}
返回uri；
}

---

我想知道我遗漏了什么？

更改端点解决了问题

发件人：

    public override ServiceProviderDescription GetServiceDescription()
    {
        return new ServiceProviderDescription
        {
            AccessTokenEndpoint = new MessageReceivingEndpoint("https://api.twitter.com/oauth/access_token", HttpDeliveryMethods.PostRequest),
            RequestTokenEndpoint = new MessageReceivingEndpoint("https://api.twitter.com/oauth/authorize", HttpDeliveryMethods.PostRequest),
            UserAuthorizationEndpoint = new MessageReceivingEndpoint("https://api.twitter.com/oauth/access_token", HttpDeliveryMethods.PostRequest),
            TamperProtectionElements = new ITamperProtectionChannelBindingElement[] { new HmacSha1SigningBindingElement() },
            ProtocolVersion = ProtocolVersion.V10
        };
    }

致：

    public override ServiceProviderDescription GetServiceDescription()
    {
        return new ServiceProviderDescription
        {
            AccessTokenEndpoint = new MessageReceivingEndpoint("https://api.twitter.com/oauth/access_token", HttpDeliveryMethods.PostRequest),
            RequestTokenEndpoint = new MessageReceivingEndpoint("https://api.twitter.com/oauth/request_token", HttpDeliveryMethods.PostRequest),
            UserAuthorizationEndpoint = new MessageReceivingEndpoint("https://api.twitter.com/oauth/authorize", HttpDeliveryMethods.PostRequest),
            TamperProtectionElements = new ITamperProtectionChannelBindingElement[] { new HmacSha1SigningBindingElement() },
            ProtocolVersion = ProtocolVersion.V10
        };
    }