title: Correct MIME Type for css.map files
body: <p>looking for a bit of help that will most likely help other devs.</p>
  
  <p>When serving files that are extension <code>.css.map</code> what should their MIME type be?</p>
  
  <p>This problem arose for me when serving files from s3 and in the upload process using boto3, one must set the MIME type for each files using the Python <a href="https://docs.python.org/2/library/mimetypes.html" rel="nofollow noreferrer">mimetypes</a> library. However <code>mimetypes</code> does not have all newer standards (i.e. '.scss', '.svg', '.js.map'). With that what is the appropriate MIME type for <code>.css.map</code> files?</p>