[1] Guidelines for Web Content Transformation Proxies 1.0 ( ( 版)) http://www.w3.org/TR/2010/NOTE-ct-guidelines-20101026/#sec-types-of-proxy

[2] Re: [mixed-content] DASH Players and Mixed Content (Ben Gidley 著, 版) https://lists.w3.org/Archives/Public/public-webappsec/2015Jul/0155.html

- Using HTTPS breaks downstream caching - this can be a big deal in some

regions. Many ISP's have transparent HTTP proxies for video and using

HLS/DASH with HTTP enables them to effectively extend the CDN into their

networks for 'free' as far as the operator is concerned.