title: Does Retrofit make network calls on main thread?
body: <p>I am trying to explore Retrofit+OkHttp on Android. Here's some code I found online : </p>
  
  <pre><code>RestAdapter restAdapter = new RestAdapter.Builder().setExecutors(executor, executor)
  .setClient(new OkClient(okHttpClient))
  .setServer("blah").toString())
  .build();
  </code></pre>
  
  <p>If I don't use executor service, will my code be running on the main thread ? Should I make web requests in a new thread hence ?</p>