web/src/main/java/org/springframework/security/web/authentication/rememberme/AbstractRememberMeServices.java
protected void cancelCookie(HttpServletRequest request, HttpServletResponse response) {
		logger.debug("Cancelling cookie");
		Cookie cookie = new Cookie(cookieName, null);
		cookie.setMaxAge(0);
		cookie.setPath(getCookiePath(request));
		if (cookieDomain != null) {
			cookie.setDomain(cookieDomain);
		}
		response.addCookie(cookie);
	}
protected void cancelCookie(HttpServletRequest request, HttpServletResponse response) {
		logger.debug("Cancelling cookie");
		Cookie cookie = new Cookie(cookieName, null);
		cookie.setMaxAge(0);
		cookie.setPath(getCookiePath(request));
		if (cookieDomain != null) {
			cookie.setDomain(cookieDomain);
		}
		response.addCookie(cookie);
	}
Sets a "cancel cookie" (with maxAge = 0) on the response to disable persistent
logins.