accept-types helps your application respond to a HTTP request in a way that a
client prefers. The Accept header of an HTTP request informs the server which
MIME types the client is expecting back from this request, with weighting to
indicate the most prefered. If your server can respond in multiple formats
(e.g.: JSON, XML, HTML), the client can easily tell your server which is the
prefered format without resorting to hacks like ‘&format=json’ on the end
of query strings.