注意：这是尝试描述复杂问题。我会根据需要提供更多细节。
在一个非常简单的ASP MVC应用程序中（专门用于解决问题），某些http请求无法完成。浏览器工具以挂起状态显示请求，并且服务器端不会引发异常。
我已使用await关键字将问题跟踪到一行代码。
await SendJsonResponse(context, StartJsonPayload);
SendJsonResponse的实现写入HttpResponse流。当我连接调试器并在await之后的行中添加一个断点时，它永远不会被击中。
打开多个浏览器窗口后，我使用了Debug Diagnostic Tool和Process Explorer。从调试诊断工具转储文件中，我发现某些似乎挂起的线程，当我使用Process explorer时，有问题的线程似乎都有相同的跟随堆栈：
usp10.dll+0x8580
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x6c0
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x4a8
wow64.dll!Wow64SystemServiceEx+0x1ce
wow64.dll!Wow64LdrpInitialize+0x42a
ntdll.dll!TpAlpcRegisterCompletionList+0x7f8b
ntdll.dll!LdrInitializeThunk+0xe
ntdll.dll!NtWaitForSingleObject+0x15
kernel32.dll!WaitForSingleObjectEx+0x43
kernel32.dll!WaitForSingleObject+0x12
clr.dll+0x4187
以下是同一线程的Debug Diagnostic工具的完整堆栈跟踪。
ntdll!ZwWaitForSingleObject+15
KERNELBASE!WaitForSingleObjectEx+98
kernel32!WaitForSingleObjectExImplementation+75
kernel32!WaitForSingleObject+12
iiscore+15cc7
iiscore+17a96
iiscore+18e66
webengine4!W3_MGD_HANDLER::ExplicitFlush+6e
webengine4!MgdExplicitFlush+24
clr!PInvokeStackImbalanceHelper+22
System_Web_ni!DomainNeutralILStubClass.IL_STUB_PInvoke(IntPtr, Boolean, Boolean ByRef)+4c
System_Web_ni!DomainNeutralILStubClass.IL_STUB_PInvoke(IntPtr, Boolean, Boolean ByRef)+4c
[[InlinedCallFrame]]
System_Web_ni!System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush()+1a
System_Web_ni!System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush()+1a
System_Web_ni!System.Web.HttpResponse.Flush(Boolean, Boolean)+a8
System_Web_ni!System.Web.HttpResponse.Flush()+17
System_Web_ni!System.Web.HttpResponse.Flush()+17
System_Web_ni!System.Web.HttpWriter.WriteFromStream(Byte[], Int32, Int32)+3e
System_Web_ni!System.Web.HttpResponseStream.Write(Byte[], Int32, Int32)+65
System_Web_ni!System.Web.HttpResponseStream.Write(Byte[], Int32, Int32)+65
Microsoft.Owin.Host.SystemWeb.CallStreams.DelegatingStream.Write(Byte[], Int32, Int32)+41
Microsoft.Owin.Host.SystemWeb.CallStreams.OutputStream.Write(Byte[], Int32, Int32)+3e
Microsoft.AspNet.SignalR.Owin.ServerResponse.Write(System.ArraySegment`1<Byte>)+67
mscorlib_ni+388730
Microsoft.AspNet.SignalR.Hosting.ResponseExtensions.End(Microsoft.AspNet.SignalR.Hosting.IResponse, System.String)+db
Microsoft.AspNet.SignalR.PersistentConnection.SendJsonResponse(Microsoft.AspNet.SignalR.Hosting.HostContext, System.String)+d1
Microsoft.AspNet.SignalR.PersistentConnection+<ProcessStartRequest>d__f.MoveNext()+17e
mscorlib_ni!System.Runtime.CompilerServices.AsyncMethodBuilderCore+MoveNextRunner.InvokeMoveNext(System.Object)+17
mscorlib_ni!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)+a7
mscorlib_ni!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)+16
mscorlib_ni!System.Runtime.CompilerServices.AsyncMethodBuilderCore+MoveNextRunner.Run()+5b
mscorlib_ni!System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.<.cctor>b__6(System.Object)+26
System_Web_ni!System.Web.AspNetSynchronizationContext+<>c__DisplayClass7.<Post>b__6()+10
System_Web_ni!System.Web.Util.SynchronizationHelper.SafeWrapCallback(System.Action)+5c
System_Web_ni!System.Web.Util.SynchronizationHelper+<>c__DisplayClass9.<QueueAsynchronous>b__7(System.Threading.Tasks.Task)+d
mscorlib_ni!System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke()+35
mscorlib_ni!System.Threading.Tasks.Task.Execute()+2e
mscorlib_ni!System.Threading.Tasks.Task.ExecutionContextCallback(System.Object)+15
mscorlib_ni!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)+a7
mscorlib_ni!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)+16
mscorlib_ni!System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef)+cb
mscorlib_ni!System.Threading.Tasks.Task.ExecuteEntry(Boolean)+b3
mscorlib_ni!System.Threading.Tasks.Task.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()+7
mscorlib_ni!System.Threading.ThreadPoolWorkQueue.Dispatch()+149
mscorlib_ni!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()+5
[[DebuggerU2MCatchHandlerFrame]]
[[ContextTransitionFrame]]
[[DebuggerU2MCatchHandlerFrame]]
我的问题是：
欢迎任何有助于调查此问题的建议。请提供可能的技术/工具。