https://docs.cloud.google.com/appengine/docs/standard/python3/reference/services/bundled/google/appengine/api/app_identity/app_identity_defaultcredentialsbased_stub/BitStringToByteString
google.appengine.api.app_identity.app_identity_defaultcredentialsbased_stub.BitStringToByteString |...
Convert a pyasn1.type.univ.BitString object to a string of bytes.
googleappengineapiidentitystub