WebRTC is a W3C Recommendation and multiple IETF standards:
The Session Description Protocol (SDP) used by WebRTC currently has two implementations:
- "Unified Plan", the spec-compliant SDP format implemented by all browsers.
We want to remove the non-standard SDP format, "Plan B", from Chromium. Removal dates have already been announced, but in order to aid applications from migrating from Plan B to Unified Plan and to ensure we can keep the deadlines we have set, a Reverse Origin Trial is desired to give applications that opt-in more time to migrate.
Deadlines and rationale for Reverse Origin Trial were provided in the intent to deprecate
. The target dates are:
M89 (Stable in February, 2021): Deprecation warning is added in the developer console.
M93 (Stable in August, 2021): Plan B is removed, with the option to extend this deadline by opting-in to a Reverse Origin Trial.
M96 (Stable in January, 2022): The extended deadline ends and Plan B is removed for everybody.
I would like to make the Reverse Origin Trial available as of M90 or M91 (when this CL
Goals for experimentation
Unblock Plan B removal.
Any risk when the experiment finishes?
If Plan B is removed while still in use, some applications would experience incompatibility issues when attempting to set up audio or video channels, especially in multi-participant conferencing setups. 1:1 calling will still work for some applications.
Ongoing technical constraints
N/A. There were some Unified Plan bugs and performance issues discovered that have been addressed in M90.
When using Plan B you will get a deprecation warning in the JS console. It will look different depending on if you have opted in to the Reverse Origin Trial.
Will this feature be supported on all five Blink platforms supported by Origin Trials (Windows, Mac, Linux, Chrome OS, and Android)?
N/A, Unified Plan was shipped several years ago. Should I create an entry even for the Reverse Origin Trial?