LongPolling broken on ASP.NET 4.5 #496

nabils · 2012-06-28T23:13:26Z

Using silverlight client version 0.5.2 and the code below invoke is only fired one time. This same code works fine using the standard .net client. This started happening a couple of versions ago.

Thanks,
Nabil

var conn = new HubConnection("http://localhost:55911/");
_hub = conn.CreateProxy("Chat");
_hub.On<string>("AddMessage", message => Deployment.Current.Dispatcher.BeginInvoke(() => Items.Add(message)));

conn.Start().ContinueWith(t =>
{
                    _hub.Invoke("Send", "Hello there from silverlight");
                    _hub.Invoke("Send", "Hello there from silverlight");
                    _hub.Invoke("Send", "Hello there from silverlight");
 });

davidfowl · 2012-06-29T03:09:21Z

Try looking at the requests in fiddler and see if they even make it to the server.
You're also not observing any exceptions, if you call .Wait() on the end, what happens?
Is there a concurrent request limit on Silverlight?

nabils · 2012-06-29T08:51:34Z

Silverlight will use the browser network stack by default (mine is IE9). This was working fine in Silverlight a couple of releases ago (some time last week).

They get to the server but the server is not able to call back to the client for the second and third invokes. The first works fine.

nabils · 2012-06-29T09:05:00Z

Just noticed in fiddler I am getting the below errors:

POST /signalr/?transport=longPolling&connectionId=4ffb3cb2-a10a-4d9e-8173-a6349be70c89&messageId=2&connectionData=[{"Name":"Chat"}] HTTP/1.1

<title>Object reference not set to an instance of an object.</title> <style> body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;} p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px} b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px} H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red } H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon } pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt} .marker {font-weight: bold; color: black;text-decoration: none;} .version {color: gray;} .error {margin-bottom: 10px;} .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; } @media screen and (max-width: 639px) { pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; } } @media screen and (max-width: 479px) { pre { width: 280px; } } </style>

<body bgcolor="white">

        <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>

        <h2> <i>Object reference not set to an instance of an object.</i> </h2></span>

        <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">

        <b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

        <br><br>

        <b> Exception Details: </b>System.NullReferenceException: Object reference not set to an instance of an object.<br><br>

        <b>Source Error:</b> <br><br>

        <table width=100% bgcolor="#ffffcc">
           <tr>
              <td>
                  <code>

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

              </td>
           </tr>
        </table>

        <br>

        <b>Stack Trace:</b> <br><br>

        <table width=100% bgcolor="#ffffcc">
           <tr>
              <td>
                  <code><pre>

[NullReferenceException: Object reference not set to an instance of an object.]
System.Web.HttpContext.get_CurrentNotification() 48
System.Web.HttpContext.GetWebSocketInitStatus() 40
System.Web.HttpContext.get_IsWebSocketRequest() 28
System.Web.HttpContextWrapper.get_IsWebSocketRequest() 9
SignalR.Hosting.AspNet.AspNetResponse.get_IsClientConnected() 71
SignalR.Transports.TransportDisconnectBase.get_IsAlive() 52
SignalR.Transports.TransportHeartBeat.AddConnection(ITrackingConnection connection) 358
SignalR.Transports.LongPollingTransport.ProcessReceiveRequest(ITransportConnection connection, Action postReceive) 56
SignalR.Transports.LongPollingTransport.ProcessRequest(ITransportConnection connection) 361
SignalR.PersistentConnection.ProcessRequestAsync(HostContext context) 1087
SignalR.Hubs.HubDispatcher.ProcessRequestAsync(HostContext context) 237
SignalR.Hosting.AspNet.AspNetHandler.ProcessRequestAsync(HttpContextBase context) 938
SignalR.Hosting.AspNet.AspNetHandler.ProcessRequestAsync(HttpContext context) 69
System.Web.<>c__DisplayClass1.<System.Web.IHttpAsyncHandler.BeginProcessRequest>b__0() 18
System.Web.TaskAsyncHelper.BeginTask(Func`1 taskFunc, AsyncCallback callback, Object state) 39
System.Web.HttpTaskAsyncHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) 77
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 268
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 155

              </td>
           </tr>
        </table>

        <br>

        <hr width=100% size=1 color=silver>

        <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.17626

        </font>

</body>

POST /signalr/reconnect?transport=longPolling&connectionId=4ffb3cb2-a10a-4d9e-8173-a6349be70c89&messageId=2&connectionData=[{"Name":"Chat"}] HTTP/1.1

<title>Object reference not set to an instance of an object.</title> <style> body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;} p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px} b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px} H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red } H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon } pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt} .marker {font-weight: bold; color: black;text-decoration: none;} .version {color: gray;} .error {margin-bottom: 10px;} .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; } @media screen and (max-width: 639px) { pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; } } @media screen and (max-width: 479px) { pre { width: 280px; } } </style>

<body bgcolor="white">

        <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>

        <h2> <i>Object reference not set to an instance of an object.</i> </h2></span>

        <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">

        <b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

        <br><br>

        <b> Exception Details: </b>System.NullReferenceException: Object reference not set to an instance of an object.<br><br>

        <b>Source Error:</b> <br><br>

        <table width=100% bgcolor="#ffffcc">
           <tr>
              <td>
                  <code>

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

              </td>
           </tr>
        </table>

        <br>

        <b>Stack Trace:</b> <br><br>

        <table width=100% bgcolor="#ffffcc">
           <tr>
              <td>
                  <code><pre>

[NullReferenceException: Object reference not set to an instance of an object.]
System.Web.HttpContext.get_CurrentNotification() 48
System.Web.HttpContext.GetWebSocketInitStatus() 40
System.Web.HttpContext.get_IsWebSocketRequest() 28
System.Web.HttpContextWrapper.get_IsWebSocketRequest() 9
SignalR.Hosting.AspNet.AspNetResponse.get_IsClientConnected() 71
SignalR.Transports.TransportDisconnectBase.get_IsAlive() 52
SignalR.Transports.TransportHeartBeat.AddConnection(ITrackingConnection connection) 358
SignalR.Transports.LongPollingTransport.ProcessReceiveRequest(ITransportConnection connection, Action postReceive) 56
SignalR.TaskAsyncHelper.Interleave(Func3 before, Func1 after, T arg, TaskCompletionSource1 tcs) 278 SignalR.Transports.LongPollingTransport.ProcessRequest(ITransportConnection connection) 336 SignalR.PersistentConnection.ProcessRequestAsync(HostContext context) 1087 SignalR.Hubs.HubDispatcher.ProcessRequestAsync(HostContext context) 237 SignalR.Hosting.AspNet.AspNetHandler.ProcessRequestAsync(HttpContextBase context) 938 SignalR.Hosting.AspNet.AspNetHandler.ProcessRequestAsync(HttpContext context) 69 System.Web.<>c__DisplayClass1.<System.Web.IHttpAsyncHandler.BeginProcessRequest>b__0() 18 System.Web.TaskAsyncHelper.BeginTask(Func1 taskFunc, AsyncCallback callback, Object state) 39
System.Web.HttpTaskAsyncHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) 77
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 268
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 155

              </td>
           </tr>
        </table>

        <br>

        <hr width=100% size=1 color=silver>

        <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.17626

        </font>

</body>

davidfowl · 2012-06-29T09:17:43Z

Try using IIS express.

nabils · 2012-06-29T10:23:46Z

I am using IIS express. Can you not reproduce it?

On 29 Jun 2012, at 10:17, David Fowler
[email protected]
wrote:

Try using IIS express.

Reply to this email directly or view it on GitHub:
#496 (comment)

nabils · 2012-06-29T22:06:49Z

Even tried IIS (windows 7) and no luck with that either. This has to be easily reproducible. Don't think I am doing anything wrong. I have checked a number of times.

CJHarmath · 2012-06-30T02:29:10Z

where is your repo ?

nabils · 2012-06-30T11:26:02Z

It was only a few of lines of code to repro which I posted above. If
you need a full repro solution let me know and I should be able to
post in a couple of days as I am travelling at the moment.

On 30 Jun 2012, at 03:29,
[email protected]
wrote:

where is your repo ?

Reply to this email directly or view it on GitHub:
#496 (comment)

davidfowl · 2012-06-30T21:48:28Z

I'll try to repro and make a fix for 0.5.3 when I do. VS2012 on a .NET 4.0 application or .NET 4.5?

nabils · 2012-07-01T11:23:17Z

VS2012 with silverlight 4. It works using .net 4 application.

Thanks

On 1 Jul 2012, at 00:48, David Fowler
[email protected]
wrote:

I'll try to repro and make a fix for 0.5.3 when I do. VS2012 on a .NET 4.0 application or .NET 4.5?

Reply to this email directly or view it on GitHub:
#496 (comment)

davidfowl · 2012-07-01T17:02:14Z

It's fixed in master

nabils · 2012-07-03T15:05:55Z

Working perfectly now. Thanks a lot.

On 1 July 2012 18:02, David Fowler <
[email protected]

wrote:

It's fixed in master

Reply to this email directly or view it on GitHub:
#496 (comment)

Best Regards,
Nabil Shuhaiber

jmpeltier · 2012-07-09T16:36:03Z

I saw this happen to me as well in 0.5.2 so I am glad a fix is on the way. I am using VS 2012 RC and .NET 4.5. I first noticed it when one of my Firefox browsers (v 13) decided to connect via Long polling instead of serverSentEvents. Not sure why it auto connected as long polling but it did. So of course I have to ask.... Any idea when 0.5.3 will be release ? :)

davidfowl · 2012-07-09T16:49:23Z

When it's released. If you need it now build from source.

Sent from my Windows Phone
From: jmpeltier
Sent: 7/9/2012 9:36 AM
To: David Fowler
Subject: Re: [SignalR] LongPolling broken on ASP.NET 4.5 (#496)
I saw this happen to me as well in 0.5.2 so I am glad a fix is on the
way. I am using VS 2012 RC and .NET 4.5. I first noticed it when
one of my Firefox browsers (v 13) decided to connect via Long polling
instead of serverSentEvents. Not sure why it auto connected as long
polling but it did. So of course I have to ask.... Any idea when
0.5.3 will be release ? :)

Reply to this email directly or view it on GitHub:
#496 (comment)

jmpeltier · 2012-07-09T16:51:09Z

No problem I understand. Like they say it never hurts to ask.

samtny · 2012-08-08T17:25:44Z

0.5.3 fixed this for me as well. It took me a while to find this thread when I searched on "signalr network error 500", so adding that tag here. :)

ghost assigned davidfowl Jun 29, 2012

davidfowl closed this as completed in 77ef3df Jul 1, 2012

davidfowl mentioned this issue Jul 1, 2012

Cross Domain Error on 0.5.2 #495

Closed

davidfowl mentioned this issue Jul 25, 2012

500 response received when running basic hubs sample on IE 10 when in IE 9 compatibility mode #561

Closed

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

LongPolling broken on ASP.NET 4.5 #496

LongPolling broken on ASP.NET 4.5 #496

nabils commented Jun 28, 2012

davidfowl commented Jun 29, 2012

nabils commented Jun 29, 2012

nabils commented Jun 29, 2012

davidfowl commented Jun 29, 2012

nabils commented Jun 29, 2012

nabils commented Jun 29, 2012

CJHarmath commented Jun 30, 2012

nabils commented Jun 30, 2012

davidfowl commented Jun 30, 2012

nabils commented Jul 1, 2012

davidfowl commented Jul 1, 2012

nabils commented Jul 3, 2012

jmpeltier commented Jul 9, 2012

davidfowl commented Jul 9, 2012

jmpeltier commented Jul 9, 2012

samtny commented Aug 8, 2012

LongPolling broken on ASP.NET 4.5 #496

LongPolling broken on ASP.NET 4.5 #496

Comments

nabils commented Jun 28, 2012

davidfowl commented Jun 29, 2012

nabils commented Jun 29, 2012

nabils commented Jun 29, 2012

davidfowl commented Jun 29, 2012

nabils commented Jun 29, 2012

nabils commented Jun 29, 2012

CJHarmath commented Jun 30, 2012

nabils commented Jun 30, 2012

davidfowl commented Jun 30, 2012

nabils commented Jul 1, 2012

davidfowl commented Jul 1, 2012

nabils commented Jul 3, 2012

jmpeltier commented Jul 9, 2012

davidfowl commented Jul 9, 2012

jmpeltier commented Jul 9, 2012

samtny commented Aug 8, 2012