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.. _contrib-modules:
Contrib Modules
===============
These modules implement various extra features, that may not be ready for
prime time.
.. _contrib-pyopenssl:
SNI-support for Python 2
------------------------
.. automodule:: urllib3.contrib.pyopenssl
.. _gae:
Google App Engine
-----------------
The :mod:`urllib3.contrib.appengine` module provides a pool manager that
uses Google App Engine's `URLFetch Service <https://cloud.google.com/appengine/docs/python/urlfetch>`_.
Example usage::
from urllib3 import PoolManager
from urllib3.contrib.appengine import AppEngineManager, is_appengine_sandbox
# This substitution will be done automagically once appengine code
# graduates from the contrib module.
if is_appengine_sandbox():
# AppEngineManager uses AppEngine's URLFetch API behind the scenes
http = AppEngineManager()
else:
# PoolManager uses a socket-level API behind the scenes
http = PoolManager()
# The client API should be consistent across managers, though some features are not available
# in URLFetch and you'll get warnings when you try to use them (like granular timeouts).
r = http.request('GET', 'https://google.com/')
There are `limitations <https://cloud.google.com/appengine/docs/python/urlfetch/#Python_Quotas_and_limits>`_ to the URLFetch service and it may not be the best choice for your application. App Engine provides three options for urllib3 users:
1. You can use :class:`AppEngineManager` with URLFetch. URLFetch is cost-effective in many circumstances as long as your usage is within the limitations.
2. You can use a normal :class:`PoolManager` by enabling sockets. Sockets also have `limitations and restrictions <https://cloud.google.com/appengine/docs/python/sockets/#limitations-and-restrictions>`_ and have a lower free quota than URLFetch. To use sockets, be sure to specify the following in your ``app.yaml``::
env_variables:
GAE_USE_SOCKETS_HTTPLIB : 'true'
3. If you are using `Managed VMs <https://cloud.google.com/appengine/docs/managed-vms/>`_, you can use the standard :class:`PoolManager` without any configuration or special environment variables.
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