code: def delete_proxy(self, proxy_url, site=None):
          
          query_parameters = {}
          if proxy_url is not None:
              query_parameters['proxyUrl'] = self._serialize.query('proxy_url', proxy_url, 'str')
          if site is not None:
              query_parameters['site'] = self._serialize.query('site', site, 'str')
          self._send(http_method='DELETE',
                     location_id='ec1f4311-f2b4-4c15-b2b8-8990b80d2908',
                     version='5.0-preview.2',
                     query_parameters=query_parameters)
docs: DeleteProxy.
          [Preview API]
          :param str proxy_url:
          :param str site: