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            "Intended Audience :: Developers",
            "License :: OSI Approved :: BSD License",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.4",
            "Programming Language :: Python :: 3.5",
            "Programming Language :: Python :: 3.6",
            "Topic :: Software Development",
            "Topic :: Utilities"
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        "description": "Django Birdcage\n===============\n\n.. image:: https://img.shields.io/pypi/pyversions/django-birdcage.svg\n    :target: https://pypi.python.org/pypi/django-birdcage\n\n.. image:: https://img.shields.io/pypi/v/django-birdcage.svg\n    :target: https://pypi.python.org/pypi/django-birdcage\n\n.. image:: https://img.shields.io/pypi/status/django-birdcage.svg\n    :target: https://pypi.python.org/pypi/django-birdcage\n\n.. image:: https://img.shields.io/pypi/l/django-birdcage.svg\n    :target: https://github.com/pybee/django-birdcage/blob/master/LICENSE\n\n.. image:: https://travis-ci.org/freakboy3742/django-birdcage.svg?branch=master\n    :target: https://travis-ci.org/freakboy3742/django-birdcage\n\nWhen deploying large websites, operations teams will sometimes deploy new code across a subset of the entire collection of webservers. This approach is called a \"Canary\" deployment. Most users will continue to be served using the old code; only those users hitting a \"Canary\" machine will see the new code.\n\nLarge websites will often use a Canary when the perceived risk of an upgrade is high. For example, upgrading the Django version from 1.8 LTS to 1.11 LTS on a complex site will generally be considered a risky upgrade; a Canary will be used to test that the upgrade is working as expected before switching all webservers over to the upgraded codebase.\n\nUnfortunately, while Django has good *backwards* compatibility guarantees, Canary deployments require *forwards* compatibility as well. This is beacuse a user may have one request served on the new codebase, but subsequent updates served from the old codebase. If information (such as security tokens) aren't both backwards *and* forwards compatible between releases, some users will see errors as the move back and forth between old and new codebases.\n\nBirdcage is a project consisting of tools to help you manage Canary upgrades, by provided *forwards* compatible shims for known problems in Django.\n\nWhat does Birdcage address?\n---------------------------\n\nDjango 1.10: Salted CSRF tokens\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nDjango 1.10 `introduced a change to CSRF handling <https://docs.djangoproject.com/en/1.11/releases/1.10/#csrf>`__ to protect against `BREACH <http://breachattack.com/>`__ attacks. Django 1.10+ can interpret Django < 1.10 CSRF tokens; however, if a user is issued a Django 1.10+ CSRF token, it will be rejected as invalid by Django 1.8.\n\nTo address this problem, Birdcage provides a version of Django 1.8's CsrfViewMiddleware that can interpret Django 1.10's CSRF tokens.\n\n* In the settings for your Django 1.8 codebase, replace ``django.middleware.csrf.CsrfViewMiddleware`` in your ``MIDDLEWARE`` setting with ``birdcage.v1_11.csrf.CsrfViewMiddleware``.\n\n* In your Django 1.10+ codebase, continue to use the Django CsrfViewMiddleware.\n\nWhy is it called Birdcage?\n--------------------------\n\nWell you have to put your canaries *somewhere* to keep them safe... :-)\n\n\n",
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