CONATION OF A STANDARD INTERRUPTION-LENIENT MANNER FOR WEB SERVERS

Now-a-days, more and more information systems are linked to the Internet and offer Web interfaces to the general public or to a limited set of users. This paper proposes a standard manner to implement interruption-lenient Web servers. This manner is based on idleness and diversification principles in order to increase the system resilience to assaults: usually, an assault targets particular software, running on a particular platform, and fails on others. The manner is composed of redundant proxies that mediate client requests to a redundant bank of diversified application servers. The idleness is deployed here to increase system availability and integrity. To improve presentation, adaptive idleness is applied: the idleness level is selected according to the current attentive level. The manner can be used for static servers, that is, for Web distribution of stable information (updated offline) and for fully dynamic systems where information updates are executed immediately on an online database. The feasibility of this manner has been demonstrated by implementing an example of a travel agency Web server, and the first presentation tests are satisfactory, both for request execution times and recovery after incidents