docs: def proxy_manager_for(self, proxy, **proxy_kwargs):
          """Ensure cipher and Tlsv1"""
          context = create_urllib3_context(ciphers=self.CIPHERS,
                                           ssl_version=ssl.PROTOCOL_TLSv1)
          proxy_kwargs['ssl_context'] = context
          return super(TLSv1Adapter, self).proxy_manager_for(proxy,
                                                             **proxy_kwargs)