FirebaseApp	The entry point of Firebase SDKs.
FirebaseOptions	Configurable Firebase options.
FirebaseOptions.Builder	Builder for constructing `FirebaseOptions`.
IncomingHttpResponse	Contains information that describes an HTTP response received by the SDK.
OutgoingHttpRequest	Contains the information that describe an HTTP request made by the SDK.
ThreadManager	An interface that controls the thread pools and thread factories used by the Admin SDK.

ErrorCode Platform-wide error codes that can be raised by Admin SDK APIs.

FirebaseException Base class for all Firebase exceptions.

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