access-control-cookie.py

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import datetime

def main(request, response):

    cookie_name = request.GET.first(b"cookie_name", b"")

    response.headers.set(b"Cache-Control", b"no-store")

    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))

    response.headers.set(b"Access-Control-Allow-Credentials", b"true")

    for cookie in request.cookies:

        # Set cookie to expire yesterday

        response.set_cookie(cookie, b"deleted", expires=-datetime.timedelta(days=1))

    if cookie_name:

        # Set cookie to expire tomorrow

        response.set_cookie(cookie_name, b"COOKIE", expires=datetime.timedelta(days=1))