When a browser requests an OracleAS Portal page:
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Oracle Application Server Web Cache fulfills the request if it contains a valid cache of the page. Otherwise, the request is forwarded to the HTTP server, which routes it through mod_plsql to an Oracle Application Server repository, which contains the required metadata.
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The database server processes the request according to customization rules and sends it to the multithreaded servlet, which initiates portlet requests to providers.
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Valid cached portlets are returned from the OracleAS Portal Cache. Providers return other portlets to the engine.
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The engine aggregates the content into a single page, which is then returned to the browser.
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