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.