Série de cours par Clément Joncquet, Franck Gil ey Cyril Roume : " Création de cours sur ItunesU ". Cours 4 du 24 septembre 2012.The class has for objective the understanding of Web application architectures and models. We look into how the Web has lead software engineers to rethinking every traditional distributed system approaches. We review key web technologies and try to get their most important principles. We take an historical approach in order to analyses similarities and reasons of evolutions of technologies.The class takes the form of several conferences in English. Slides are available.http://mon.univ-montp2.fr/claroline/course/index.php?cid=P1S911