title: SignalR port requirement
body: <p>I haven't found much discussion about this...
  Most signalr samples I have seen would send and receive via a designated port like 5000 or 8080
  I have a need for chatting in my app. My asp.net backend site does more than just handling messages between users, so it doesn't make a difference for me to host another page for that in the site my iis. 
  I understand the difference of having the signalr self-hosted or hosted normally in iis... If I have it hosted by iis, so my users will access the page normally without a port, would that make a difference? Is there something internal in signalr that is preferring the use of a port? What are the pros/cons of using ports with signalr?</p>