Expansion of port blocking?

[annevk]

Per email to blink-dev it sounds like Chrome will block more ports than just those listed in Fetch:

Starting in Chrome 91, and possibly backporting into earlier versions as we verify that it doesn't break things, we intend to only permit connecting to port 443 and port numbers above 1024.

Ideally that would be tested and standardized...

[alvestrand]

Note - this new restriction is for TURN servers only.

[annevk]

Okay, so if we address #2613 I suspect this would best be done before invoking "obtain a connection" as maintaining a large blocklist that's TURN-specific in Fetch seems a tad odd. The way the failure is exposed should still be identical so we can move things around as needed.

[ricea]

Chrome has now unblocked port 80 and port 53 as well. Apparently along with 443 these are commonly used for firewall traversal.