image cache service
图床
https://github.com/weserv/images
meta & referrer
demo
<img src="https://img1.doubanio.com/view/ark_article_cover/retina/public/55712959.jpg?v=1536826763.0" alt="">
防盗链 / 防下载
image / video 防盗链策略
refs
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta
https://wiki.whatwg.org/wiki/Meta_referrer
https://www.freebuf.com/news/57497.html
https://blog.mythsman.com/post/5d2c153067f841464434a42a/
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