*.ampproject.org was briefly blocked in Iran about bbs HOT 4 OPEN

On mobile, by default, sites open with the https://google.com/amp/s/ without requesting *.ampproject.org.

But in the source code, www.google.com/amp (the "AMP viewer") contains an iframe that still loads the main content from cdn.ampproject.org.

$ curl https://www.google.com/amp/s/www.bbc.com/persian.amp -A 'Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1'
...
<iframe name="https://www.bbc.com/persian.amp" src="https://www-bbc-com.cdn.ampproject.org/v/s/www.bbc.com/persian.amp?..." ...></iframe>

See the comments around https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/25985#note_2592342 for some more discussion.

from bbs.

The block was short enough that it was not caught by any OONI measurements. Here are the measurements around that time:
https://explorer.ooni.org/search?until=2020-07-31&domain=cdn.ampproject.org&probe_cc=IR&test_name=web_connectivity (archive)

The nearest measurements are at 2020-07-27 12:44:54 and 2020-07-30 10:53:09, and they are both normal. The block of cdn.ampproject.org must have begun and ended in between.

I do not find the incident reported in Google's transparency report for Iran (archive)

from bbs.

On mobile, by default, sites open with the https://google.com/amp/s/ without requesting *.ampproject.org. Blocking it has no effect on preventing unpleasant sites for governments!

from bbs.

I tested it manually at that particular time, and DNS, HTTP, and HTTPS were blocked.
The commands were like:

dig cdn.ampproject.org @1.1.1.1 # returned 10.10.34.35
curl -4v --trace-time -m 31 --connect-to ::www.example.com: http://cdn.ampproject.org/  # returned <ifram src="http://10.10.34.35/">...
curl -4v --trace-time -m 31 --connect-to ::www.example.com: https://cdn.ampproject.org/ # timeout after Client hello

However, on some ISPs ampproject.com and ampproject.org are still blocked:
https://explorer.ooni.org/search?since=2020-07-26&until=2020-08-06&domain=ampproject.org&probe_cc=IR&test_name=web_connectivity
https://explorer.ooni.org/search?since=2020-07-26&until=2020-08-06&domain=ampproject.com&probe_cc=IR&test_name=web_connectivity

from bbs.