[Webkit-unassigned] [Bug 201640] No candidates when trying to subscribe to a media flow without publishing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201640

--- Comment #1 from youenn fablet <youennf at gmail.com> ---
WebRTC candidates are used for fingerprinting purposes to collect private IP addresses, hence why this is filtered.

Recent Safari version support mDNS candidates https://tools.ietf.org/html/draft-mdns-ice-candidates, you should see them flowing in your cases. You can check Safari Tech Preview for instance or latest MacOS/iOS betas.

Usually, in subscription cases, there is a server with a public IP address.
In that case, Safari will receive the candidates from the server and connect to it without the need of giving candidates to the web app (see PRFLX candidates).

Some server implementations do not proceed with the connection until a candidate is explicitly given to them. This can be fixed server-side.

See also https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/discuss-webrtc/6stQXi72BEU/QY3VZwJHAwAJ

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