title: Returning a stream from a Spring REST Controller
body: <p>I am curios if it is possible to return a <code>Stream</code> from a Spring <code>RestController</code></p>
  
  <pre><code>@RestController
  public class X {
    @RequestMapping(...)
    public Stream&lt;?&gt; getAll() { ... }
  }
  </code></pre>
  
  <p>Is it ok to do something like this? I tried and Spring returns something else other than the values of a stream.</p>
  
  <p>Shall I keep returning a <code>List&lt;?&gt;</code>?</p>