A leading open-source web server used widely around the world.
An open-source web server with a modular architecture. It has been used for years thanks to flexible configuration and rich extensibility, though migration toward event-driven servers such as Nginx has been advancing in recent years. It uses a Multi-Processing Module (MPM) that assigns a process or thread per request, switchable between models like prefork, worker, and event -- but under heavy concurrent load, this per-request allocation tends to consume more memory than Nginx's event-driven model.
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