OAuth2 credentials representing the built-in service account for Google App Engine. You should
only use this class if you are running on AppEngine and are using urlfetch.
Fetches access tokens from the App Identity service.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025年10月30日 UTC."],[],[]]