title: In Vert.x, should REST endpoints return Future<T> or T?
body: <p>I am having a hard time finding documentation on which is the correct return type.</p>
  <p>For example, if I have a REST endpoint which lookups and returns a String should the endpoint have a return type of <code>Future&lt;String&gt;</code> or <code>String</code>? Further, what impact would this have on the event loop (i.e. would returning <code>String</code> over <code>Future&lt;String&gt;</code> cause more blocking)?</p>
  <p>Thanks!</p>