class Grape::Middleware::Error

def error!(message, status = options[:default_status], headers = {}, backtrace = [], original_exception = nil)
  env[Grape::Env::API_ENDPOINT].status(status) # not error! inside route
  rack_response(
    status, headers.reverse_merge(Rack::CONTENT_TYPE => content_type),
    format_message(message, backtrace, original_exception)
  )
end