title: mediastreamvalidator showing "Illegal MIME type" `application/x-mpegURL`
body: <p>I ran an m3u8 manifest through <code>mediastreamvalidator</code> and then through <code>hlsreport</code> and the first error under &quot;Must Fix Issues&quot; is this:</p>
  <pre><code>1. Illegal MIME type
  
      All Variants, MIME type: application/x-mpegURL
      All Renditions, MIME type: application/x-mpegURL
      Master Playlist, MIME type: application/x-mpegURL
  </code></pre>
  <p>I'm a bit confused because <code>application/x-mpegURL</code> is the <a href="https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/DeployingHTTPLiveStreaming/DeployingHTTPLiveStreaming.html" rel="nofollow noreferrer">apple-recommended</a> MIME type for m3u8 streams. How do I make sense of this?</p>