title: Add headers to @aspnet/signalr Javascript client
body: <p>I'm using @aspnet/signalr Official Javascript client from <a href="https://www.npmjs.com/package/@aspnet/signalr" rel="nofollow noreferrer">This npm package</a></p>
  
  <p>I wondering if there is the way to add Header configuration to the client connection header</p>
  
  <p>How I build the connection</p>
  
  <p><code>
  let connection = new signalR.HubConnectionBuilder()
    .withUrl(
      "https://some.signalr-host.com" 
      )
    .build();
  </code></p>