module Roda::RodaPlugins::Json::RequestMethods

def block_result_body(result)

application/json content-type.
convert the result to json and return it as the body, using the
If the result is an instance of one of the json_result_classes, 
def block_result_body(result)
  case result
  when *roda_class.json_result_classes
    response[CONTENT_TYPE] = APPLICATION_JSON
    convert_to_json(result)
  else
    super
  end
end