render_for_api_request

# File actionpack/lib/action_dispatch/middleware/debug_exceptions.rb, line 90
      def render_for_api_request(content_type, wrapper)
        body = {
          status: wrapper.status_code,
          error:  Rack::Utils::HTTP_STATUS_CODES.fetch(
            wrapper.status_code,
            Rack::Utils::HTTP_STATUS_CODES[500]
          ),
          exception: wrapper.exception_inspect,
          traces: wrapper.traces
        }

        to_format = "to_#{content_type.to_sym}"

        if content_type && body.respond_to?(to_format)
          formatted_body = body.public_send(to_format)
          format = content_type
        else
          formatted_body = body.to_json
          format = Mime[:json]
        end

        render(wrapper.status_code, formatted_body, format)
      end