def call(env)
      handler = self.class.build(env)
      handler.call(env)
    rescue => e
      self.class.handle_error(e)
    end
def call(env)
      handler = self.class.build(env)
      handler.call(env)
    rescue => e
      self.class.handle_error(e)
    end
Instances of classes derived from [Kawaii::Base] are Rack applications.