Couldn't resolve host 'www.googleapis.com' from Google App Engine PHP SDK

Hello, We Are Using Google App Engine and Pub/Sub Google Service for our Web Application. We are adding a message to a queue using the latest PHP SDK and we are experiencing this error : An uncaught Exception was encountered Type: GuzzleHttp\Exception\ConnectException Message: cURL error 6: Couldn't resolve host '[login to view URL]' (see [login to view URL]) Filename: /base/data/home/apps/s~magic-sourcing-prototype/2.396168442205938731/application/vendor/guzzlehttp/guzzle/src/Handler/[login to view URL] Line Number: 211 We need help to fix it.