Re: [tor-bugs] #25985 [Obfuscation/Snowflake]: Add AMP cache as another domain fronting option with Google

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#25985: Add AMP cache as another domain fronting option with Google
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 Reporter:  twim                   |          Owner:  (none)
     Type:  project                |         Status:  new
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by twim):

 Replying to [comment:7 dcf]:
 Thanks for breaking it down!

 > Okay yeah, I found these guides to the URL format. The `c` means content
 (can also be `r` for resource or `i` for image) and the `s` means use TLS.
 >   https://developers.google.com/amp/cache/overview#amp-cache-url-format
 >   https://www.ampbyexample.com/advanced/using_the_google_amp_cache/#amp-
 cache-url-format

 Strange, I've seen this docs to find out what /s means, though I took the
 URL itself from desktop Google search results. This URL (in amper) uses
 /v/s/ location instead of /c/s/. I don't see any docs on that. Maybe it is
 a deprecated format, however it doesn't explain why Google still use it
 then.


 >   https://www.ampproject.org/latest/blog/whats-in-an-amp-url/
 > The "*.cdn.ampproject.org" ones they call "AMP Cache" URLs and the
 "google.com/amp" ones they call "AMP Viewer" URLs. It seems like the "AMP
 Viewer" URLs are only produced automatically by Google in search result
 pages. But yeah, in any case, you can domain-front the "AMP Cache" URLs.

 Also this google.com/amp viewer seems to use iFrames to download content
 from the CDN anyway.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25985#comment:8>
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