def ocsp_urls(self):
        """
        :return:
            A list of zero or more unicode strings of the OCSP URLs for this
            cert
        """

        if not self.authority_information_access_value:
            return []

        output = []
        for entry in self.authority_information_access_value:
            if entry['access_method'].native == 'ocsp':
                location = entry['access_location']
                if location.name != 'uniform_resource_identifier':
                    continue
                url = location.native
                if url.lower().startswith(('http://', 'https://', 'ldap://', 'ldaps://')):
                    output.append(url)
        return output
:return:
            A list of zero or more unicode strings of the OCSP URLs for this
            cert