Question

我正在为Windows 8.1和Windows Phone 8.1编写通用应用程序。我需要打开长轮询请求以不断更新数据流。我使用HttpClient执行此操作并且其工作正常，除了从流中获取新数据的巨大延迟。在WinRT上，这个延迟大约10-20秒，在Windows Phone上大约需要1-2分钟（!!!）。这对于这个应用程序是不可接受的，我希望我的代码有问题，有人可以帮我修复它。这是我的代码：

var handler = new HttpClientHandler();
using (var client = new HttpClient(handler))
{
      client.Timeout = TimeSpan.FromMilliseconds(Timeout.Infinite);
      client.BaseAddress = new Uri("https://my.site.com/");
      handler.CookieContainer.SetCookies(client.BaseAddress, cookies);

      var link = "my/link";
      using (var tokenRequestMessage = new HttpRequestMessage(HttpMethod.Get, link))
      {
           tokenRequestMessage.Headers.Add("Authorization", token);
           tokenRequestMessage.Headers.Add("Foo", "Foo");
           tokenRequestMessage.Headers.Add("Foo1", "Foo2");
           var t = await client.SendAsync(tokenRequestMessage, HttpCompletionOption.ResponseHeadersRead);

           using (var httpResponse = t.Content)
           {
                using (var v = await httpResponse.ReadAsStreamAsync())
                {
                    using (var reader = new StreamReader(v))
                    {
                        while (!reader.EndOfStream)
                        {
                            Debug.WriteLine(reader.ReadLine());
                        }
                    }
                }
           }
     }
}

Answer 1

嗯，这就是我完成任务的方式。它的工作并不完美，但是当它出现在InputStream时，我立即获得数据。

var uri = new Uri("www.example.com");
using (var client = new Windows.Web.Http.HttpClient())
{
  client.DefaultRequestHeaders.Cookie.ParseAdd(this.sessionCookies);
  client.DefaultRequestHeaders.Add("header", "value");

  var response = await client.GetAsync(uri, Windows.Web.Http.HttpCompletionOption.ResponseHeadersRead);
  var inputStream = await response.Content.ReadAsInputStreamAsync();
  IBuffer buffer = new Buffer(10000);

  do
  {
       buffer = await inputStream.ReadAsync(buffer, buffer.Capacity, InputStreamOptions.ReadAhead);
       var data = Encoding.UTF8.GetString(buffer.ToArray(), 0, (int) buffer.Length);
       Debug.WriteLine(data);                        
   } while (buffer.Length > 0);
}

Winrt / WP8.1中长轮询请求的大幅延迟

1 个答案: