code: def check(self, url_data):
          
          host = url_data.urlparts[1]
          if host in self.checked_hosts:
              return
          self.checked_hosts.add(host)
          cert = url_data.ssl_cert
          config = url_data.aggregate.config
          if cert and 'notAfter' in cert:
              self.check_ssl_valid_date(url_data, cert)
          elif config['sslverify']:
              msg = _('certificate did not include "notAfter" information')
              url_data.add_warning(msg)
          else:
              msg = _('SSL verification is disabled; enable the sslverify option')
              url_data.add_warning(msg)
docs: Run all SSL certificate checks that have not yet been done.
          OpenSSL already checked the SSL notBefore and notAfter dates.