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Explain how Nginx can handle HTTP requests?

Nginx an event based http server that uses the reactor pattern. Although it's a single threaded, but can fork multiple processes to consume several cores. Usually, the main event loop waits for the operating system to signal a readiness event, which means the data can be accessed and read from a socket, at which instance it read into a buffer and processed. The single thread is capable enough to serve tens of thousands of synchronous connections.

Here thread-per-connection model would fail because of the large consumption of memory (as each thread requires its own stack) and the huge context-switching overhead.

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