Constant EXTENSIONS_ON_NONEXISTENT_14 

const EXTENSIONS_ON_NONEXISTENT_14: &str = "Any Object may have extension headers except those \
                                            with Object Status 'Object Does Not Exist'. If an \
                                            endpoint receives a non-existent Object containing \
                                            extension headers it MUST close the session with a \
                                            PROTOCOL_VIOLATION.";