Gunicorn

gunicorn.org · checked 4 Oct 2026

#5 · Application Servers #20 · Web Server Software

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How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Application Servers6.1#5 of 28

Gunicorn is a Python WSGI HTTP server for running Python web applications.

Pricing

GunicornOpen-source Python WSGI/ASGI server · sponsorship and sponsored support contracts are optionalFree

As gunicorn.org lists them, checked 4 Oct 2026.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: gunicorn.org
Price: Free tier
Free trial: No
ASGI features: The native ASGI worker supports HTTP/1.1, HTTP/2 with SSL, WebSockets, lifespan hooks, SSL/TLS, and the uWSGI protocol.
Deployment integrations: The deployment guide recommends running Gunicorn behind a proxy and includes Nginx configuration as well as examples for HAProxy, stunnel, and AWS load balancers.
Founded: 2010
Frameworks: The site lists Django, Flask, FastAPI, Pyramid, Starlette, Falcon, Bottle, and Quart as compatible frameworks.
Installation: The installation guide lists pip, pipx, Docker, and system packages for Debian/Ubuntu, Fedora, and Arch Linux.
Monitoring: Optional statsD instrumentation over UDP reports request rates, request duration, worker counts, and log event rates.
Paid support: The project offers sponsored support contracts for priority bug fixes and feature requests.
Project history: The support page says Gunicorn has served Python web applications since 2010 and is downloaded millions of times per month.
Python requirement: The installation guide says Gunicorn requires Python 3.12 or newer.
Security guidance: The deployment guide warns that default synchronous workers can be vulnerable to denial-of-service attacks unless the proxy buffers slow clients.
Security reporting: The community page asks users to report security vulnerabilities privately to [email protected]; only core developers subscribe to that list.
Support: The project provides GitHub issues and discussions plus a Libera.Chat channel, and notes that chat has no guaranteed watcher.

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