Yikes looks like someone didn't setup SSL properly on the project's website (http redirects to https) https://www.ampproject.org/ it'd be nice to see some of the examples.
edit
Google cache isn't loading everything - at least to my knowledge.
I am not entirely sure, as a web developer I've never seen a certificate pass all SSL checkers yet chrome and firefox on my computer (up-to-date) won't load them. I pondered a MITM attack but it's literally the only site this happens on - not exactly sure what is causing the https to not load on my end.
edit All I get is "ERR_SSL_PROTOCOL_ERROR" - I'm pretty sure I tested this link out at work but I will again on Monday to verify it happens there (currently I'm tethered as well as vpn'd to PIA and I don't think my provider T-Mobile is doing anything to block this one ssl)
edit Google cache isn't loading everything - at least to my knowledge.
edit 2 Yay web-archive to the rescue!
http://web.archive.org/web/20160811220337/https://www.amppro...