def create(opts={})
      Request::Xml.put(topic_path) do |request|
        msg_options = {
            MaximumMessageSize: 65536
        }.merge(opts)
        request.content :Topic, msg_options
      end
    end
def create(opts={})
      Request::Xml.put(topic_path) do |request|
        msg_options = {
            MaximumMessageSize: 65536
        }.merge(opts)
        request.content :Topic, msg_options
      end
    end
创建topic