Add bing-amp.com to the list of AMP Cache hosts

[westonruter]

See https://blogs.bing.com/Webmaster-Blog/September-2018/Introducing-Bing-AMP-viewer-and-Bing-AMP-cache

The AMP protocol offers the ability to cache and serve cached copied AMP content that is published on the web, providing faster user experiences on Bing. In order to enable your AMP published content within Bing, you need to allow the Bingbot (our crawler) to fetch AMP content and allow cross-origin resource sharing (CORS) for bing-amp.com domain. Most AMP enabled sites and advertisers have already authorized the CORS sharing for the ampproject.org domain, but now need to also bing-amp.com to the allowed list.

Nevertheless, I'm not sure if it is supposed to be https://bing-amp.com or https://www.bing-amp.com, as the former name does not resolve but the latter does.

[amedina]

Welcome Bing Cache!

[westonruter]

Let's wait to merge until we get confirmation on www.bing-amp.com vs bing-amp.com.

[westonruter]

The Bing AMP cache URLs look like this: https://amp-timeinc-net.bing-amp.com/c/amp.timeinc.net/time/5453956/apec-summit-2018-papua-new-guinea-png