package request: py3-secure-cookie
https://pypi.org/project/secure-cookie/
https://github.com/pallets/secure-cookie
https://secure-cookie.readthedocs.io/en/latest/
This used to be a part of py3-werkzeug, but split to a separate project with werkzeug 1.0.
cc @prspkt as py3-werkzeug maintainer.