DeleteProxy.
        [Preview API]
        :param str proxy_url:
        :param str site:

def delete_proxy(self, proxy_url, site=None):
        """DeleteProxy.
        [Preview API]
        :param str proxy_url:
        :param str site:
        """
        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)