WebApplication:
1. Browser UI: ajax request, http request, location, document, window, js, DOM tree
2. Servelet Container:
2.1 accept http request
2.2 wrappe to HttpServletRequest and back to client with HttpServletResponse
2.3 URL mapping
2.4. View
2.4.1 View name
2.4.2 View Template
2.4..3 View Resolver
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2.4.4 View controller
2.4.5 View Router
2.5 Interception
2.6 Filter
2.7 URL mapping Handler -->Controller