Latest version: 22.0.0


Here's a quick rundown on how to get started with Gunicorn. For more details read the documentation.

  $ pip install gunicorn
  $ cat
    def app(environ, start_response):
        data = b"Hello, World!\n"
        start_response("200 OK", [
            ("Content-Type", "text/plain"),
            ("Content-Length", str(len(data)))
        return iter([data])
  $ gunicorn -w 4 myapp:app
  [2014-09-10 10:22:28 +0000] [30869] [INFO] Listening at: (30869)
  [2014-09-10 10:22:28 +0000] [30869] [INFO] Using worker: sync
  [2014-09-10 10:22:28 +0000] [30874] [INFO] Booting worker with pid: 30874
  [2014-09-10 10:22:28 +0000] [30875] [INFO] Booting worker with pid: 30875
  [2014-09-10 10:22:28 +0000] [30876] [INFO] Booting worker with pid: 30876
  [2014-09-10 10:22:28 +0000] [30877] [INFO] Booting worker with pid: 30877


Gunicorn is a WSGI HTTP server. It is best to use Gunicorn behind an HTTP proxy server. We strongly advise you to use nginx.

Here's an example to help you get started with using nginx:

  server {
    listen 80;
    access_log  /var/log/nginx/example.log;

    location / {
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

Nginx is set up as reverse proxy server to a Gunicorn server running on localhost port 8000.

Read the full documentation at

Project Management

Gunicorn uses GitHub for the project management. GitHub issues are used for 3 different purposes:

Project maintenance guidelines are available on the wiki


The Gunicorn channel is on the Libera Chat IRC network. You can chat with the community on the #gunicorn channel.

Issue Tracking

Bug reports, enhancement requests and tasks generally go in the Github issue tracker.

Security Issues

The security mailing list is a place to report security issues. Only developers are subscribed to it. To post a message to the list use the address


You can read more comprehensive documentation at

The contents are: