CloudFlare 這幾天的動作頗多：「Universal SSL: Encryption all the way to the origin, for free」。
Universal SSL 要保護的是右邊 CloudFlare 到 Origin Server 這段：現在可以讓 CloudFlare 簽 SSL certificate，而不用到外面買了。
這邊的 SSL certificate 只有 CloudFlare 認得，一般的瀏覽器預設值不會認：
The CloudFlare Origin CA is currently not trusted by browsers, so these certificates should not be used on sites that are not behind CloudFlare.