code: def get_proxies(self, proxy_url=None):
          
          query_parameters = {}
          if proxy_url is not None:
              query_parameters['proxyUrl'] = self._serialize.query('proxy_url', proxy_url, 'str')
          response = self._send(http_method='GET',
                                location_id='ec1f4311-f2b4-4c15-b2b8-8990b80d2908',
                                version='5.0-preview.2',
                                query_parameters=query_parameters)
          return self._deserialize('[Proxy]', self._unwrap_collection(response))
docs: GetProxies.
          [Preview API]
          :param str proxy_url:
          :rtype: [Proxy]