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http://tongzh.github.io/2017/06/21/pact-reference-guide-zh
http://tongzh.github.io/2017/04/18/the-value-of-microservices
http://tongzh.github.io/2016/04/01/an-performance-optimization-example-for-ruby-on-rails-application
http://tongzh.github.io/2014/02/07/build-a-ruby-web-application-involved-with-db
http://tongzh.github.io/2014/02/06/build-a-ruby-web-application