8. A Client/Server Computing Model Client Computer Browser Server Computer HTTP Service HTTP REQUEST HTTP RESPONSE (URL,Post,Get,..) (XHTML...) A State-less Environment
9. Client Browser (state A) HTTP Server HTTP REQUEST HTTP RESPONSE New Page Default Synchronous Processing Scenario Client Browser (state B) (state A) (state A + … = state B)
10. Client Browser (state D) Client Browser (state A) HTTP Server REQUEST RESPONSE – New Page Asynchronous Processing Scenario Client Browser (state C) Client Browser (state B) REQUEST/RESPONSE REQUEST/RESPONSE Using XMLHttpRequest Object