GetProxies.
        [Preview API]
        :param str proxy_url:
        :rtype: [Proxy]

def get_proxies(self, proxy_url=None):
        """GetProxies.
        [Preview API]
        :param str proxy_url:
        :rtype: [Proxy]
        """
        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))