RateLimiterInterceptor.java

public boolean preHandle(
    HttpServletRequest request,
    HttpServletResponse response,
    Object handler) {

    Map<String, String> pathVars = (Map<String, String>)
       request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);

    if (!rateLimiter.tryAccess(pathVars.get(USER_ID))) {
        response.setStatus(TOO_MANY_REQUEST);
        response.setHeader(RETRY_AFTER, IN_300_SECS);
        return false;
    }
    return true;
}