"""Register a RequestHandler class"""
assert issubclass(handler, RequestHandler), f'{handler} must be a subclass of RequestHandler'
assert handler.RH_KEY not in _REQUEST_HANDLERS, f'RequestHandler {handler.RH_KEY} already registered'
"""Register a RequestHandler class"""
assert issubclass(handler, RequestHandler), f'{handler} must be a subclass of RequestHandler'
assert handler.RH_KEY not in _REQUEST_HANDLERS, f'RequestHandler {handler.RH_KEY} already registered'