如標題所說的，Reddit 在規劃這些阻擋 Adblock 的網站：「Mod Announcement: We're considering banning all domains that require users to disable ad blockers and we'd like your input」。
這些網站要求使用者將網站列入 Adblock 白名單，然後這些網站就會「不小心」推送 malware 給使用者：
It has come to our attention that many websites such as Forbes and Wired are now requiring users to disable ad blockers to view content. Because Forbes requires users to do this and has then served malware to them we see this as a security risk to you our community. There are also sites such as Wall Street Journal that have implemented pay-walls which we were are also considering banning.
Amazon CloudFront 新增了 Whitelist Header 的功能：「Deliver Custom Content With CloudFront」。
如同在 post 裡說明的：
If you choose the Whitelist option, each header that you add to the list becomes part of the cache key for the URLs associated with the distribution.
有點像是 HTTP 協定裡
Vary 想要解決的問題，只是做在 CDN 這端。這個功能蠻多 CDN 都有，AWS 總算補上了...
這次除了可以針對 custom HTTP header 處理外，CloudFront 還做了不少事情：
- Mobile Device Detection
- Multi-Site Hosting
- Protocol Detection
- CORS (Cross Origin Resource Sharing)
前兩項還蠻有意義的，這代表會有人幫你更新資料。而 CloudFront 總算是支援 CORS 了...