public HaltException halt(int status, String body) {
        throw new HaltException(status, body);
    }
Immediately stops a request within a filter or route with specified status code and body content
NOTE: When using this don't catch exceptions of type HaltException, or if catched, re-throw otherwise
halt will not work

@param status The status code
@param body   The body content
@return HaltException object with status and body set
src/main/java/spark/Service.java