title: react-router redirect to a different domain url
body: <p>I am using react-router for client side routing. I have a button and when some one clicks the button, I want to redirect the user to a different url.
  For e.g I want to redirect the user to "<a href="http://www.google.com" rel="noreferrer">http://www.google.com</a>". I used navigation mixin and used this.transitionTo("<a href="https://www.google.com" rel="noreferrer">https://www.google.com</a>"). But when I do this I get this error
  Invariant Violation: Cannot find a route named "<a href="https://www.google.com" rel="noreferrer">https://www.google.com</a>".</p>
  
  <p>I can use window.location but is that the right way to go?</p>