title: What's the difference between response.body() and object returned by the callback?
body: <p>From Spark Java <a href="http://sparkjava.com/documentation.html#response" rel="noreferrer">documentation</a>:</p>
  
  <pre><code>response.body("Hello");        // sets content to Hello
  </code></pre>
  
  <p>And from <a href="http://javadox.com/com.sparkjava/spark-core/2.3/spark/Route.html#handle-spark.Request-spark.Response-" rel="noreferrer">Route's JavaDoc</a>:</p>
  
  <pre><code>@return The content to be set in the response
  </code></pre>
  
  <p>So what's the difference? Could someone explain to me pls?</p>