Google App Engine Flexible Environment Python Compat Runtime

This repository contains the source code used for the App Engine Flexible Environment Python Compat runtime. This runtime provides best effort compatibility with applications written to target the App Engine Standard Environment with Python 2.7. This runtime is currently in alpha.

This runtime is intended for users migrating applications from App Engine Standard to App Engine Flex. For users building new applications on App Engine with Python, we recommend following the getting started guide.

Using this runtime

Please refer to the docs on how to use and customize this runtime.

Gunicorn configuration

By default the multi-process version of the runtime is launched via the Gunicorn webserver and is configured to use gevent-based concurrency and a number of processes equal to the number of CPU cores available.

This can be changed by creating a file called gunicorn.conf.py in your application's root directory, which will override the default gunicorn.conf.py included with this project. Refer the gunicorn documentation for details.

Caveats

This runtime is currently an alpha. As this is a alpha product, some functionality has not yet been implemented, and a few things may change.

Notably:

• Handlers in app.yaml that are flagged as login: required or login: admin are not supported. Attemping to access these handlers will result in a 404 as the handlers will not be registered.
• threadsafe: false in app.yaml is ignored. Your application must either be threadsafe or you much change the gunicorn configuration to use sync workers.

There may be other features that work on the current Python runtime and are not implemented or not functional in this version. Please open an issue on Github for any you encounter.

Contributing changes

See CONTRIBUTING.md

Licensing

See LICENSE