This concurrency model implements a single-threaded app dispatch with a separate thread pool for writing responses.
Unlike most Rainbows! concurrency models,
WriterThreadPool is designed to run behind nginx just like
Unicorn is. This concurrency model may be useful for existing
Unicorn users looking for more output concurrency than socket buffers can provide while still maintaining a single-threaded application dispatch (though if the response body is dynamically generated, it must be thread safe).
For serving large or streaming responses, using more threads (via the
worker_connections setting) and setting "proxy_buffering off" in nginx is recommended. If your application does not handle uploads, then using any HTTP-aware proxy like haproxy is fine. Using a non-HTTP-aware proxy will leave you vulnerable to slow client denial-of-service attacks.
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