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# App Identity Exceptions

The `google.appengine.api.app_identity` package provides the following exception classes:

exception BackendDeadlineExceeded()

  Raised when the communication to the backend service times out.

exception BlobSizeTooLarge()

  Raised when the size of the blob to sign is larger than the allowed limit.

exception Error()

  This is the base class for all exceptions in this package.

exception InternalError()

  Raised when an unspecified internal failure occurs.