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int | Nonec C s0 t jd }|du r dS t|t�rt|�� �S |S )an Used by :func:`send_file` to determine the ``max_age`` cache
value for a given file path if it wasn't passed.
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the configuration of :data:`~flask.current_app`. This defaults
to ``None``, which tells the browser to use conditional requests
instead of a timed cache, which is usually preferable.
Note this is a duplicate of the same method in the Flask
class.
.. versionchanged:: 2.0
The default configuration is ``None`` instead of 12 hours.
.. versionadded:: 0.9
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set.
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class.
.. versionadded:: 0.5
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with:
.. code-block:: python
with app.open_resource("schema.sql") as f:
conn.executescript(f.read())
:param resource: Path to the resource relative to
:attr:`root_path`.
:param mode: Open the file in this mode. Only reading is
supported, valid values are "r" (or "rt") and "rb".
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