In terms of Abstract Factory design pattern, the IHTTPHandlerFactory forms the abstract factory,
the IHTTPHandler forms the abstract product, the PageHandlerFactory forms the concrete factory and the Page class forms the concrete Product.
IHTTPHandlerFactory<->Abstract Factory
IHTTPHandler<->abstract produc
pagehandlerfactory<->concrete factory (1 or more)
Page Class<->concrete Product. (1 or more)
