    # File lib/mongrel.rb, line 320
        def register(uri, handler, in_front=false)
          begin
            @classifier.register(uri, [handler])
          rescue URIClassifier::RegistrationError
            handlers = @classifier.resolve(uri)[2]
            method_name = in_front ? 'unshift' : 'push'
            handlers.send(method_name, handler)
          end
          handler.listener = self
        end