c# - 在 Plaid API 上使用 .net 客户端的 Exchange_Token 调用因异常而失败

Question

我正在尝试调用 Plaid 测试环境以使用 C# 客户端将 Stripe 与 Plaid 集成。

但是我无法交换 token ，而我可以使用 curl 客户端成功交换。代码 super 简单。

    public async Task<string> ExchangeToken(string publicToken, string accountId)
    {
        string bankAccountToken = null;

        try
        {
            var parameters = new Dictionary<string, string>()
            {
                {"client_id", this.clientId},
                {"secret", this.clientSecret},
                {"public_token", publicToken},
                {"account_id", accountId}
            };

            using (var client = new HttpClient())
            {
                var request = new HttpRequestMessage()
                {
                    RequestUri = new Uri(this.BaseAddress, "exchange_token"),
                    Method = HttpMethod.Post,
                    Content = new FormUrlEncodedContent(parameters)

                };


                var requestResult = await client.SendAsync(request);
                var stringResponse = requestResult.Content.ReadAsStringAsync();
            }



        }
        catch (Exception ex)
        {
            Trace.TraceError("PlaidHelper::ExchangeToken() hit error " + ex.Message);
        }

        return bankAccountToken;
    }

调用失败并出现 IO 异常，表明远程方关闭了连接，内部异常消息为 “身份验证失败，因为远程方已关闭传输流。”

有人有什么想法吗？我正准备拔头发..

这是成功的相应 curl 调用。

$ curl -v https://tartan.plaid.com/exchange_token -d client_id="XXXXX" -d 
secret="XXXXXXXXXXXXXXXX" -d public_token="XXXXXXXXXXX" -d account_id="XXXXX"

> POST /exchange_token HTTP/1.1
> Host: tartan.plaid.com
> User-Agent: curl/7.50.3
> Accept: */*
> Content-Length: 263
> Content-Type: application/x-www-form-urlencoded
>
} [263 bytes data]
* upload completely sent off: 263 out of 263 bytes
{ [5 bytes data]
< HTTP/1.1 200 OK
< Content-Type: application/json; charset=utf-8
< Date: Thu, 27 Oct 2016 04:55:53 GMT
< Vary: X-HTTP-Method-Override, Accept-Encoding
< X-Request-Id: 65af9ef1009c46f5b9f484b5c6aee975
< Content-Length: 295
< Connection: keep-alive
<
{ [295 bytes data]
* Curl_http_done: called premature == 0
100   558  100   295  100   263    262    233  0:00:01  0:00:01 --:--:--   273{
  "access_token": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
  "account_id": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
  "stripe_bank_account_token": "btok_XXXXXXXXXXX"
}
* Connection #0 to host tartan.plaid.com left intact

Answer 1

您可能正在使用 .NET 4.5，其中默认情况下未启用 TLS 1.2，因此您需要在 C# 代码中为出站连接显式启用 TLS 1.2。你可以这样做:

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls

(来源:https://stackoverflow.com/a/35321007/5307473)