This domain is an example domain for demonstrating AMP Web Packaging.
If this page is loaded from a normally configured web browser, the returned document will simply be a normally served AMP document. However, if this page is requested by a useragent that sends the headers:
Accept: application/signed-exchange;v=b3 AMP-Cache-Transform: google;v="1..3"
Then the document will be returned within a Signed Exchange with HTML transforms appropriate for serving on the Google AMP Cache.
For example, using the following curl command:
curl -H 'Accept: application/signed-exchange;v=b3' \ -H 'AMP-Cache-Transform: google;v="1..3"' \ -i https://amppackageexample.com/ | less
More information can be found at the following links: