title: What is the right extension for files with JSONP?
body: <p>I have a file with <a href="https://en.wikipedia.org/wiki/JSONP" rel="nofollow noreferrer">JSONP</a> (hard-written callback) and I named it <code>file.jsonp</code>. Unfortunately server treats it as "text/plain" and browser returns warning:</p>
  
  <blockquote>
    <p>Resource interpreted as Script but transferred with MIME type text/plain.</p>
  </blockquote>
  
  <p>Calling it <code>file.json</code> causes the same warning. So what is the right extension? It works with <code>file.js</code>, but I don't think it is the right way.</p>