Sets the service authentication credentials. If no credentials are set, GoogleCredentials#getApplicationDefault() will be used to attempt getting credentials from
the environment. Use NoCredentials#getInstance() to skip authentication, this is
typically useful when using local service emulators.
Sets the static header provider. The header provider will be called during client
construction only once. The headers returned by the provider will be cached and supplied as
is for each request issued by the constructed client. Some reserved headers can be overridden
(e.g. Content-Type) or merged with the default value (e.g. User-Agent) by the underlying
transport layer.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[],[]]