Javascript client breaks if relative url doesn't start with a slash

[davidfowl]

let connection = new signalR.HubConnection('chat');

Information: Normalizing 'chat' to 'http://localhost:5000chat'
signalr-client-1.0.0-alpha1.min.js:1 Error: Failed to start the connection. SyntaxError: Failed to execute 'open' on 'XMLHttpRequest': Invalid URL

We should check if the path doesn't start with a slash and add it.

[moozzyk]

Should we add it or throw an error?

[davidfowl]

I'm in favor of adding it.

[moozzyk]

This was fixed with 982ac32