title: Connection ID required
body: <p>I am trying to build a simple chat application using <a href="https://github.com/aspnet/SignalR" rel="noreferrer">SignalR</a> with ASP.NET Core 2.0. 
  The problem is that when I want to access one of my hub's url (<code>localhost:5000/chat</code>) I receive as a response: <code>Connection ID required</code> with error code <code>400</code>. I am using auto generated from template authentication (users are stored in local db).</p>
  
  <p>Here are the following components:</p>
  
  <p><a href="https://pastebin.com/mNT6gfgd" rel="noreferrer">Startup.cs</a></p>
  
  <p><a href="https://pastebin.com/0i7K2zS1" rel="noreferrer">ChatHub.cs</a></p>
  
  <p>Any help will be really appreciated. If you need any further information - please let me know. </p>