title: What are the differences between using `rails server` and `rackup`?
body: <p>The only difference I've noted is that <code>rails server</code> starts the server on port 3000, while <code>rackup</code> starts the server on port 9292.</p>
  
  <p>Are there any other differences?</p>
  
  <p>Are there use cases for one instead of the other?</p>