Question

我有外部api，可以返回一些数据。当我尝试curl命令时，一切正常：

curl -k -d "grant_type=client_credentials" -H "Authorization: Basic token" https://url

我已经使用相同的参数从c＃发出了HttpRequest，但不是成功，而是出现错误502和错误消息

代理错误（不允许使用指定的安全套接字层（SSL）端口。ForefrontTMG未配置为允许来自此端口的SSL请求。大多数Web浏览器使用端口443进行SSL请求。）

我在同一台机器上进行curl和http请求。

通过Microsoft HttpClient请求

var handler = new WebRequestHandler();
handler.ServerCertificateValidationCallback = (requestMessage, certificate, chain, policyErrors) => true;

using (var httpClient = new HttpClient(handler))
{
    using (var request = new HttpRequestMessage(new HttpMethod("POST"), $"{uri}"))
    {
        request.Headers.TryAddWithoutValidation("Authorization", $"Basic {token}");
        request.Content = new StringContent(String.Concat("grant_type", "=", WebUtility.UrlEncode("client_credentials")));
        request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
        var response = httpClient.SendAsync(request).Result;
    }
}

通过RestSharpClient请求

var client = new RestClient($"{uri}");
client.ClearHandlers();
client.RemoteCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;
var request = new RestRequest(Method.POST);
request.AddHeader("Accept", "*/*");
request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request.AddHeader("Authorization", $"Basic {token}");
request.AddParameter("grant_type", "client_credentials", ParameterType.GetOrPost);
IRestResponse response = client.Execute(request);

Answer 1

关于您的问题，我认为这是Forefront TMG服务器的局限性，而不是HttpClient的问题。请参见此article，将Forefront TMG服务器配置为允许从443旁边的其他端口进行连接。

无法发出HttpClient请求（错误的网关502）C＃

1 个答案: