title: login authentication with HttpClient returns status 463
body: <p>I am trying to connect to an API that has given me the log in example of:</p>
  
  <pre><code> POST /api/login  
   Host: nephele.qtestnet.com  
   Cache-Control: no-cache  
   Content-Type: application/x-www-form-urlencoded  
   j_username= maxmccloud%40qasymphony.com&amp;j_password=p@ssw0rd  
  </code></pre>
  
  <p>I tried to implement this as:</p>
  
  <pre><code>class QTestDriver
  {
      HttpClient http = new HttpClient();
      public QTestDriver()
      {
          http.BaseAddress = new Uri("http://ahpra.testnet.com");
      }
  
      public async void Login()
      {
          HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "/api/login");
          request.Headers.CacheControl = new CacheControlHeaderValue() { NoCache = true };
          request.Content = new StringContent("j_username=scott&amp;j_password=xxxx", Encoding.UTF8, "application/x-www-form-urlencoded");
          HttpResponseMessage resp = await http.SendAsync(request);
      }
  }
  </code></pre>
  
  <p>However the response I get is </p>
  
  <pre><code>"StatusCode: 463, ReasonPhrase: 'Unknown', Version: 1.0, Content: System.Net.Http.StreamContent, Headers:\r\n{\r\n  X-Cache: MISS from webtitan\r\n  Proxy-Connection: close\r\n  Date: Fri, 20 Mar 2015 05:04:32 GMT\r\n  ETag: \"5501c94b-19c4\"\r\n  Server: nginx/1.7.9\r\n  Via: 1.0 webtitan (squid/3.0.STABLE26)\r\n  Content-Length: 6596\r\n  Content-Type: text/html\r\n}"    string
  </code></pre>
  
  <p>I have googled this but can't find anything useful about Status 463.</p>