'https://www.w3.org/TR/referrer-policy/#strip-url
If url is null, return no referrer.
If url\'s scheme is a local scheme, then return no referrer.
Set url\'s username to the empty string.
Set url\'s password to null.
Set url\'s fragment to null.
If the origin-only flag is true, then:
Set url\'s path to null.
Set url\'s query to null.
Return url.'

def strip_url(self, url, origin_only=False):

    if (not url):
        return None
    return strip_url(url, strip_credentials=True, strip_fragment=True, strip_default_port=True, origin_only=origin_only)
