外部ドメインからのAjaxリクエストを許可する

response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, DELETE, OPTIONS");
response.setHeader("Access-Control-Allow-Headers", request.getHeader("Access-Control-Request-Headers"));
response.setHeader("Access-Control-Max-Age", "-1");