WEB对于OPTIONS请求处理

HttpServletRequest httpRequest = (HttpServletRequest) request;

HttpServletResponse httpResponse = (HttpServletResponse) response;

httpResponse.setHeader("Access-Control-Allow-Credentials", "true");

httpResponse.setHeader("Access-Control-Allow-Origin", "*");

httpResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");

httpResponse.setHeader("Access-Control-Allow-Headers", "api");

if ("OPTIONS".equals(httpRequest.getMethod())) {

    httpResponse.setStatus(204);

    //httpResponse.setHeader("Cache-Control", "no-cache");

}