【发布时间】：2013-02-12 20:22:46
【问题描述】：
我正在开发一个网络聊天应用程序，但遇到了一个奇怪的问题。该应用程序在我的本地机器上运行良好，但只是卡在远程机器上。
我完全迷路了，如何提供有关我的问题的线索（如果有追踪问题的技巧，请告知），我从$.connection.hub.error 得到的唯一错误是
Protocol error: Unknown transport.
Description: 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.
Exception Details: System.InvalidOperationException: Protocol error: Unknown transport.
Source Error:
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.
Stack Trace:
[InvalidOperationException: Protocol error: Unknown transport.]
Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(HostContext context) +866
Microsoft.AspNet.SignalR.Hubs.HubDispatcher.ProcessRequest(HostContext context) +174
Microsoft.AspNet.SignalR.Owin.CallHandler.Invoke(IDictionary`2 environment) +628
Microsoft.AspNet.SignalR.Owin.Handlers.HubDispatcherHandler.Invoke(IDictionary`2 environment) +222
Microsoft.Owin.Host.SystemWeb.OwinCallContext.Execute() +55
Microsoft.Owin.Host.SystemWeb.OwinHttpHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object extraData) +259
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
Microsoft.Owin.Host.SystemWeb.CallContextAsyncResult.End(IAsyncResult result) +110
Microsoft.Owin.Host.SystemWeb.OwinHttpHandler.EndProcessRequest(IAsyncResult result) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8836913
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
这是控制台日志提供的内容。
SignalR: Negotiating with '<root_url>/signalr/negotiate'. jquery.signalR-1.0.0-rc2.js:54
SignalR: Attempting to connect to SSE endpoint '<root_url>/signalr/connect?transport=serverSentEv…2fc32a4&connectionData=%5B%7B%22name%22%3A%22xmppservicehub%22%7D%5D&tid=7' jquery.signalR-1.0.0-rc2.js:54
SignalR: EventSource timed out trying to connect jquery.signalR-1.0.0-rc2.js:54
SignalR: EventSource readyState: 0 jquery.signalR-1.0.0-rc2.js:54
SignalR: EventSource calling close() jquery.signalR-1.0.0-rc2.js:54
SignalR: This browser supports SSE, skipping Forever Frame. jquery.signalR-1.0.0-rc2.js:54
SignalR: SignalR: Initializing long polling connection with server. jquery.signalR-1.0.0-rc2.js:54
SignalR: Attempting to connect to '<root_url>/signalr/connect?transport=longPolling&…fc32a4&connectionData=%5B%7B%22name%22%3A%22xmppservicehub%22%7D%5D&tid=10' using longPolling. jquery.signalR-1.0.0-rc2.js:54
SignalR: Longpolling connected jquery.signalR-1.0.0-rc2.js:54
SignalR: Attempting to connect to '<root_url>/signalr?transport=longPolling&connecti…%7CS%2C1%7CT%2C0%7CQ%2C0&groups=%5B%22XmppServiceHub.howtodemo%22%5D&tid=2' using longPolling. jquery.signalR-1.0.0-rc2.js:54
SignalR: Attempting to connect to '<root_url>/signalr?transport=longPolling&connecti…%7CR%2C0%7CS%2C1%7CT%2C0&groups=%5B%22XmppServiceHub.howtodemo%22%5D&tid=8' using longPolling. jquery.signalR-1.0.0-rc2.js:54
SignalR: Attempting to connect to '<root_url>/signalr?transport=longPolling&connecti…%7CR%2C0%7CS%2C1%7CT%2C0&groups=%5B%22XmppServiceHub.howtodemo%22%5D&tid=5' using longPolling. jquery.signalR-1.0.0-rc2.js:54
SignalR: An error occurred using longPolling. Status = error. <html>
<head>
<title>Protocol error: Unknown transport.</title>
仅供参考：
- 服务器端是一个 SignalR 集线器，描述了只读会话 here
- Asp.Net MVC 4
- IIS 6 网络服务器
我不知道如何提供任何线索，如果这些信息不够，请告诉我应该提供更多信息。
编辑
使用 nuget（版本 1.0.0）的最新库更新后，我收到以下错误（仍然是相同的控制台日志，在本地机器上但在远程机器上仍然可以正常工作）
[ObjectDisposedException]: The CancellationTokenSource has been disposed.
Server stack trace:
at System.Threading.CancellationTokenSource.ThrowIfDisposed()
at System.Threading.CancellationTokenRegistration.Dispose()
at Microsoft.AspNet.SignalR.Infrastructure.CancellationTokenExtensions.<>c__DisplayClass6`1.<SafeRegister>b__1()
at Microsoft.AspNet.SignalR.Infrastructure.DisposableAction.Dispose(Boolean disposing)
at Microsoft.AspNet.SignalR.Infrastructure.DisposableAction.Dispose()
at Microsoft.AspNet.SignalR.Transports.TransportHeartbeat.EndConnection(ConnectionMetadata metadata)
at Microsoft.AspNet.SignalR.Transports.TransportHeartbeat.AddConnection(ITrackingConnection connection)
at Microsoft.AspNet.SignalR.Transports.LongPollingTransport.ProcessRequest(ITransportConnection connection)
at Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(HostContext context)
at Microsoft.AspNet.SignalR.Hubs.HubDispatcher.ProcessRequest(HostContext context)
at Microsoft.AspNet.SignalR.Owin.CallHandler.Invoke(IDictionary`2 environment)
at Microsoft.AspNet.SignalR.Owin.Handlers.HubDispatcherHandler.Invoke(IDictionary`2 environment)
at Microsoft.Owin.Host.SystemWeb.OwinCallContext.Execute()
at Microsoft.Owin.Host.SystemWeb.OwinHttpHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object extraData)
Exception rethrown at [0]:
at Microsoft.Owin.Host.SystemWeb.Utils.<>c__DisplayClass1.<GetRethrowWithNoStackLossDelegate>b__0(Exception ex)
at Microsoft.Owin.Host.SystemWeb.Utils.RethrowWithOriginalStack(Exception ex)
at Microsoft.Owin.Host.SystemWeb.CallContextAsyncResult.End(IAsyncResult result)
at Microsoft.Owin.Host.SystemWeb.OwinHttpHandler.EndProcessRequest(IAsyncResult result)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
提前致谢
【问题讨论】：
-
您是否已将客户端 SignalR javascript 更新到最新版本？
-
我已更新到最新版本 (1.0.0) 但出现另一个异常。查看我的编辑。
-
本 1.0.1 的更新修复了对象处理异常。
标签： c# asp.net-mvc signalr signalr-hub