title: How can you make sure a username won't conflict with an existing route?
body: <p>So I'd like to have urls on my site like <a href="http://foobar.com/hadees" rel="noreferrer">http://foobar.com/hadees</a> that goes to someone's profile.  However when registering usernames how do I make sure they don't pick something that will conflict with my existing routes?</p>
  
  <p>I'm guessing I need to get a list of the existing routes but I'm not sure how to do it.</p>