c# - 使用 RESTSHARP 时 API 返回错误

Question

当使用 RestSharp 调用 API 时出现此错误:

The underlying connection was closed: An unexpected error occurred on a send.

我已验证我的客户端 ID、密码、用户名和密码正确无误。我能够在 PowerShell 中毫无问题地执行此操作。

public string GetTokenForBrightIdea()
{
    RestClient restclient = new RestClient(_uri);
    RestRequest request = new RestRequest() { Method = Method.POST };

    request.AddHeader("Accept", "application/json");
    request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
    request.AddParameter("grant_type", "password");
    request.AddParameter("client_id", _clientId);
    request.AddParameter("client_secret", _clientSecret);
    request.AddParameter("username", _clientUsername);
    request.AddParameter("password", _clientPassword);

    var tResponse = restclient.Execute(request);
    var responseJson = tResponse.Content;
    return JsonConvert.DeserializeObject<Dictionary<string, object>>(
        responseJson)["access_token"].ToString();
}

使用 RestSharp 完成这项工作时，我错过了什么？

Answer 1

事实证明，因为这个调用是 HTTPS，所以我需要添加以下代码行

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;