Crash when browsing a site hosted in Pretzel taste

[tathamoddie]

System.InvalidOperationException was unhandled
HResult=-2146233079
Message="An asynchronous socket operation is already in progress using this SocketAsyncEventArgs instance.";
Source=System
StackTrace:
at System.Net.Sockets.SocketAsyncEventArgs.StartOperationCommon(Socket socket)
at System.Net.Sockets.Socket.ReceiveAsync(SocketAsyncEventArgs e)
at Firefly.Utils.SocketWrapper.ReceiveAsync(SocketAsyncEventArgs e) in :line 0
at Firefly.Http.Connection.Go(Boolean newFrame) in :line 0
at Firefly.Http.Connection.b__13(Object _) in :line 0
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
InnerException:

[laedit]

Fixed by #298.