php - Trouble with CurlException in GAE - "Couldn't resolve host" -

i having trouble in google app engine using guzzle php calling https://api.mercadolibre.com/sites/mlm/categories/all

exception 'guzzle\http\exception\curlexception' message '[curl] 6: couldn't resolve host 'api.mercadolibre.com' [url] https://api.mercadolibre.com/sites/mlm/categories/all' in /base/data/home/apps/s~starry-journal-99514/1.385597037367626041/vendor/guzzle/guzzle/src/guzzle/http/curl/curlmulti.php:359

any suggestions?