The main entry point to Nucleus is though its request-handling facilities. When a Web application running Nucleus receives an HTTP request, it invokes a series of servlets and servlet filters that process the request and construct the response:

The following figure illustrates this process, and shows how the processing differs depending on whether the request is JSP or JHTML:

For more information about ATG’s request handling pipelines, see the Request Handling with Servlet Pipelines chapter in this guide.

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