<mime-type type="application/vnd.denovo.fcselayout-link">
    <glob pattern="*.fe_launch"/>
  </mime-type>
  <mime-type type="application/vnd.digilite.prolights">
    <tika:link>http://support.digilite.eu/?digilite=library</tika:link>
    <_comment>digilite.eu Prolights configuration file</_comment>
    <_comment>Note glob clash with Adobe's .fdf</_comment>
    <!--<glob pattern="*.fdf"/>-->
    <magic priority="50">

with a content type of `text/plain` containing JSON data would be accepted and the JSON data would be extracted.

But requests with content type `text/plain` are exempt from [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) preflights, for being considered [Simple requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests). So, the browser would execute them right away including cookies, and the text content could be a JSON string that would be parsed and...