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# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
"""
Method ``http_connection``
--------------------------
The ``http_connection`` method evaluates a request as the request of a bot if
the Connection_ header is set to ``close``.
.. _Connection:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection
"""
from typing import Optional, Tuple
import flask
def filter_request(request: flask.Request) -> Optional[Tuple[int, str]]:
if request.headers.get('Connection', '').strip() == 'close':
return 429, "bot detected, HTTP header 'Connection=close'"
return None
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