It uses Signed HTTP Exchanged. https://blog.amp.dev/2018/05/08/a-first-look-at-using-web-packaging-to-improve-amp-urls/ https://blog.amp.dev/2018/05/08/a-first

It uses Signed HTTP Exchanged. https://blog.amp.dev/2018/05/08/a-first-look-at-using-web-packaging-to-improve-amp-urls/ https://blog.amp.dev/2018/05/08/a-first-look-at-using-web-pa...