Abstract
The growth of the World Wide Web has been very important in the few past years, especially because applications development is fairly easy. This is due to the simplicity of the HTTP protocol. However, developing on the Web complex applications which must access to databases or GIS servers is painful because HTTP is stateless. This is the case with the cartographic application we are currently developing for which we need session management and background processing. We propose a general framework of a companion server which takes care of all the lacks of the HTTP daemon encountered in a user session management. The server memorizes all the users actions and is able to deal with eventual refinements of parts of the query by the user. The architecture we designed is based on “communicating automata”. We use these basic components to build the CGI, the server, and the drivers of the specific applications.
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