The No. 1 Question Everyone Working in Youtube買訂閱 Should Know How to Answer
http://martinlnum262.cavandoragh.org/what-the-heck-is-youtube-guan-kan-ci-shu
So when a particular consumer is asking the server to determine a certain area title, the DNS domain name system then does Examine if it's the power for a site title, and if it does, the method doesnt have to cache