REST API: provide character encoding in header

[pietervanleeuwen]

It would be nice if the REST-API could include the character encoding that is used to encode the content (e.g. UTF-8) in the content-type response header of the request. This way it's clear for any application what encoding is used and how the response should be parsed.

Current situation:
Content-Type: application/xml

Requested situation:
Content-Type: application/xml; charset=utf-8