title: Disabling GraphQL introspection requests on production
body: <p>For company policies reasons I must disable the introspection feature of <code>graphql-ruby</code> gem (making the <code>__schema</code> requests fail / return 404).</p>
  
  <p>How do I achieve this?</p>
  
  <p>The application is based on Ruby on Rails version 5.2.2 and the <code>graphql-ruby</code> gem version is 1.8.12.</p>