Google's AMP architecture historically placed cached publisher pages inside the Google AMP Viewer and displayed google.com/amp URLs instead of publisher URLs.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 10: BUILDING-BLOCK REALITY Catching the Spotlight

"Google’s AMP architecture historically placed cached publisher pages inside the Google AMP Viewer and displayed google.com/amp URLs instead of publisher URLs."

Google acknowledged that AMP's instant-loading implementation placed pages in the Google AMP Viewer and historically displayed google.com/amp in the address bar, later developing signed exchanges to restore publisher URLs.

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Source title Instant-loading AMP pages from your own domain

Source authors Devin Mullins and Greg Rogers

Source year 2019

Confidence high

Importance high