我正在为我的 Android 应用程序使用 Google Cloud Messaging (GCM) 服务。我已经按照所有规则实施了它,并且它有效。嗯,差不多。
大多数情况下,我会说在 60-70% 的情况下,我可以使用 google 网页上讨论的 web 服务从我的服务器成功发送 GCM 消息。
正常情况下,我从 webservice 收到以下回复,这表明我成功发送了 GCM 消息:
{
    "multicast_id":8378088572050307085,
    "success":1,
    "failure":0,
    "canonical_ids":0,
    "results":
    [
        {
            "message_id":"0:1363080282442710%7c4250c100000031"
        }
    ]
}
这就是说:一切正常,消息已发送。
但是,在许多情况下,我在调用 Web 服务时会收到 HTTP 错误,上面写着:
无法从传输连接读取数据:已建立的连接被主机中的软件中止。
这是 .NET 消息,告诉我调用 Web 服务(使用 HttpWebRequest 和 POST)失败。
这是一些显示问题的日志消息:

这是我用来调用 WS 的代码:
public static string SendMessage(string registrationId, string command, string extra, bool retry)
{
    try
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://android.googleapis.com/gcm/send");
        request.Method = PostWebRequest;
        request.KeepAlive = false;
        GCMPostPacket json = new GCMPostPacket()
        {
            collapse_key = "1",
            time_to_live = 60,
            registration_ids = new List<string>(new string[] { registrationId }),
            data = new GcmData()
            {
                message = command,
                misc = extra
            }
        };
        // Converting to JSON string
        string jsonString = SICJsonProtocol.JSONHelper.Serialize<GCMPostPacket>(json);
        byte[] byteArray = Encoding.UTF8.GetBytes(jsonString);
        request.ContentType = "application/json";
        request.ContentLength = byteArray.Length;
        request.ProtocolVersion = HttpVersion.Version10;
        request.Headers.Add(HttpRequestHeader.Authorization, "key=" + "MyVerySecretKey");
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();
        using (WebResponse response = request.GetResponse())
        {
            HttpStatusCode responseCode = ((HttpWebResponse)response).StatusCode;
            if (responseCode.Equals(HttpStatusCode.Unauthorized) || responseCode.Equals(HttpStatusCode.Forbidden))
            {
                Console.WriteLine("Unauthorized - need new token");
            }
            else if (!responseCode.Equals(HttpStatusCode.OK))
            {
                Console.WriteLine("Response from web service not OK :");
                Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            }
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string responseLine = reader.ReadLine();
            Console.WriteLine("************************");
            Console.WriteLine("GCM send: " + responseCode + " | " + responseLine);
            // This is the log shown in the image above
            SRef.main.gui.ServiceUpdate("GCM send: " + responseCode + " | " + responseLine);
            reader.Close();
            response.Close();
            return responseLine;
        }
    }
    catch (Exception e)
    {
        // This is the log shown in the image above
        SRef.main.gui.ServiceUpdate("Failed send GCM, " + (retry ? "retrying in 20 sec" : "not retrying") + ". Error=" + e.Message);
        if (retry)
        {
            System.Threading.ThreadPool.QueueUserWorkItem(delegate(object obj)
            {
                try
                {
                    System.Threading.Thread.Sleep(20000);
                    SendMessage(registrationId, command, extra, false);
                }
                catch (Exception ex)
                {
                }
            });
        }
        return null;
    }
}
任何人都可以看到我是否做错了什么,或者我是否缺少一般的东西?