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This module provides a pool manager that uses Google App Engine's
`URLFetch Service `_.
Example usage::
from urllib3 import PoolManager
from urllib3.contrib.appengine import AppEngineManager, is_appengine_sandbox
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()
r = http.request('GET', 'https://google.com/')
There are `limitations `_ to the URLFetch service and it may not be
the best choice for your application. There are three options for using
urllib3 on Google App Engine:
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:`~urllib3.PoolManager` by enabling sockets.
Sockets also have `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 `App Engine Flexible
`_, you can use the standard
:class:`PoolManager` without any configuration or special environment variables.
"""
from __future__ import absolute_import
import io
import logging
import warnings
from ..exceptions import (
HTTPError,
HTTPWarning,
MaxRetryError,
ProtocolError,
SSLError,
TimeoutError,
)
from ..packages.six.moves.urllib.parse import urljoin
from ..request import RequestMethods
from ..response import HTTPResponse
from ..util.retry import Retry
from ..util.timeout import Timeout
from . import _appengine_environ
try:
from google.appengine.api import urlfetch
except ImportError:
urlfetch = None
log = logging.getLogger(__name__)
class AppEnginePlatformWarning(HTTPWarning):
pass
class AppEnginePlatformError(HTTPError):
pass
class AppEngineManager(RequestMethods):
"""
Connection manager for Google App Engine sandbox applications.
This manager uses the URLFetch service directly instead of using the
emulated httplib, and is subject to URLFetch limit