def METHOD_NAME(self, params):
    if params is None:
        return ""
    if not isinstance(params, dict):
        raise TypeError("'params' must be a dict")
    # Header starts with "CYPHER"
    params_header = "CYPHER "
    for key, value in params.items():
        params_header += str(key) + "=" + stringify_param_value(value) + " "
    return params_header