Register a root to serve files from. The input can either be a
        file or a directory. See

def static(self, uri, file_or_directory, pattern=r'/?.+',
               use_modified_since=True, use_content_range=False):
        '''Register a root to serve files from. The input can either be a
        file or a directory. See
        '''
        static_register(self, uri, file_or_directory, pattern,
                        use_modified_since, use_content_range)