admin-ajax.php 是 WordPress 用于Ajax请求的必需文件，在使用缓存插件的情况下，如果你的网站使用了Ajax请求网站数据，可能会时不时出现 admin-ajax.php 403 的情况，怎样确定 admin-ajax.php 403 是不是因为缓存插件导致的呢?
后台缓存插件中清空缓存，然后到浏览器中随便访问网站的一个页面，F12 打开调试模式。
Ctrl + F5 强制刷新前台页面，发现 admin-ajax.php 可以正常加载，说明是缓存导致了问题。
联想到通常使用Ajax时，我们都会使用 WordPress 内置的Nonce机制来添加请求安全验证。如果Nonce的值失效了，但是缓存仍在，就会出现请求被拒绝。
Nonce 的默认有效期为24小时，所以，解决该问题的办法就是定时清空缓存，或者不要缓存admin-ajax.php请求。
比如，如果你使用的是 WP Rocket 缓存插件，可以将 /wp-admin/admin-ajax.php 添加到排除路径中：
如果使用的是 WP Fastest Cache 或 WP Super Cache 等缓存插件，可以设置一个时间自动清空缓存，比如 WP Fastest Cache 可以在【删除缓存】选项卡按照下图添加一个规则：每10小时清空一次全部缓存。
其他缓存插件就不介绍了，总之就是找到自动清理缓存的设置选项，设置自动清理缓存的时间不超过12小时，应该就可以了。
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