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The request context contains per-request information. The Flask
app creates and pushes it at the beginning of the request, then pops
it at the end of the request. It will create the URL adapter and
request object for the WSGI environment provided.
Do not attempt to use this class directly, instead use
:meth:`~flask.Flask.test_request_context` and
:meth:`~flask.Flask.request_context` to create this object.
When the request context is popped, it will evaluate all the
functions registered on the application for teardown execution
(:meth:`~flask.Flask.teardown_request`).
The request context is automatically popped at the end of the
request. When using the interactive debugger, the context will be
restored so ``request`` is still accessible. Similarly, the test
client can preserve the context after the request ends. However,
teardown functions may already have closed some resources such as
database connections.
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