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searxng/searx/botdetection/http_connection.py

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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
+
+"""
+# pylint: disable=unused-argument
+
+from __future__ import annotations
+from ipaddress import (
+    IPv4Network,
+    IPv6Network,
+)
+
+import flask
+import werkzeug
+
+from searx.tools import config
+from ._helpers import too_many_requests
+
+
+def filter_request(
+    network: IPv4Network | IPv6Network,
+    request: flask.Request,
+    cfg: config.Config,
+) -> werkzeug.Response | None:
+
+    if request.headers.get('Connection', '').strip() == 'close':
+        return too_many_requests(network, "HTTP header 'Connection=close")
+    return None