'html' 'text/html'
  'xhtml' 'application/xhtml+xml'
  'xml' 'application/xml' 'text/xml' 'application/x-xml'
  'json' 'application/json' 'text/x-json' 'application/jsonrequest'
  'js' 'text/javascript' 'application/javascript' 'application/x-javascript'
  'css' 'text/css'
  'rss' 'application/rss+xml'
  'yaml' 'application/x-yaml' 'text/yaml'
  'atom' 'application/atom+xml'
  'text' 'text/plain'
  'png' 'image/png'
  'jpg' 'image/jpeg' 'image/pjpeg'
  'gif' 'image/gif'
  'form' 'multipart/form-data' 'url-form' 'application/x-www-form-urlencoded'
  'csv' 'text/csv'