How can I test the CDN of Google's AMP Project

Question

Quoted from here: https://www.ampproject.org/docs/get_started/about-amp.html

AMP is a way to build web pages for static content that render fast. AMP in action consists of three different parts:

• AMP HTML
• AMP JS
• AMP CDN

AMP HTML is HTML with some restrictions for reliable performance and some extensions for building rich content beyond basic HTML. The AMP JS library ensures the fast rendering of AMP HTML pages. The AMP CDN (optionally) delivers the AMP HTML pages.

Quoted from here: https://www.ampproject.org/how-it-works/

Google is offering a service that delivers AMP HTML documents given their URL through its CDN.

Where can I find this CDN service, so I can test it? I googled a lot, but I couldn't find any information.

Answer 1

If you visit the Using the Google AMP Cache page in the AMP developer documentation then there is a textbox where you can enter your original URL and it will show you the corresponding AMP cache URL.

Answer 2

For a text example with http:

http://example.com/blog/index.html

Cache URL is:

https://example-com.cdn.ampproject.org/c/example.com/blog/index.html

With https:

https://example.com/blog/index.html

Cache URL is (notice the /s/):

https://example-com.cdn.ampproject.org/c/s/example.com/blog/index.html

For an image, replace the /c/ with /i/, for example,

http://example.com/blog/picture.jpeg

Cache URL is:

https://example-com.cdn.ampproject.org/i/s/example.com/blog/picture.jpeg

More details on cache URL name construction and name construction tools can be found here: https://developers.google.com/amp/cache/overview

Answer 3

The CDN URL will change in 2017: https://developers.googleblog.com/2016/12/amp-cache-updates.html

Example from above:

https://amp-theguardian-com.cdn.ampproject.org/c/s/amp.theguardian.com/childrens-books-site/2016/jan/12/sugar-tax-andy-mulligan-liquidator

Answer 4

To use the AMP project CDN, you can access via a URL of the form:

https://cdn.ampproject.org/c/s/<origin-domain>/<path>

Note that the /s portion is optional and signals a secure origin, so if the origin isn't served over https, then you would use:

https://cdn.ampproject.org/c/<origin-domain>/<path>

So, if we take the following URL that has an AMP equivalent: http://www.theguardian.com/childrens-books-site/2016/jan/12/sugar-tax-andy-mulligan-liquidator, looking at the source, we see the following link:

<link rel="amphtml" href="https://amp.theguardian.com/childrens-books-site/2016/jan/12/sugar-tax-andy-mulligan-liquidator">

So, we can form a CDN URL for that AMP document as:

https://cdn.ampproject.org/c/s/amp.theguardian.com/childrens-books-site/2016/jan/12/sugar-tax-andy-mulligan-liquidator

Source: https://github.com/ampproject/amphtml/blob/master/src/service/cid-impl.js#L201