title: Where do rack application output goes?
body: <p>I have a rack application running in the following way:</p>
  
  <pre><code>$: &lt;&lt; File.expand_path("../lib",__FILE__)
  
  require '&lt;my_app&gt;/api'
  
  STATIC_DIR = File.expand_path("../public/",__FILE__)
  
  run Rack::Cascade.new [&lt;my_app&gt;::API, Rack::Directory.new(STATIC_DIR)]
  </code></pre>
  
  <p>and it runs with puma like this:</p>
  
  <pre><code>exec rackup -s Puma -p $PORT
  </code></pre>
  
  <p>My app is some kind of a simple API written with ruby's grape rest api.
  my question is, where do all the application output goes ? I mean, all the GET requests for example, i am pretty new to this, and was not able to find it.</p>