ActiveResource is not extracting errors from an XML response if the Content-Type is 'application/xml; charset=utf-8'

A change to ActiveResource::Validations was introduced in 2.3.4 which adds support for JSON errors:

http://github.com/rails/rails/commit/797588543ed70b4c5dcf51d7f1e4a7...

The following test was added to the "save_with_validation" method:

  case error.response['Content-Type']
  when 'application/xml'
    errors.from_xml(error.response.body)
  when 'application/json'
    errors.from_json(error.response.body)
  end

This is looking for an exact match on Content-Type 'application/xml'.

If, for example, the returned Content-Type is 'application/xml; charset=utf-8' then the error response is ignored.