Enable IETF QUIC transport on 25.lts.30

[Goshin John]

Hi there,

Appreciate the detailed documentation for setting up and building. I have successfully built Cobalt 25.lts.30 for Android arm-softfp with the prebuilt evergreen 5.30.2 and starboard 16.

When testing the APK on an Android 15 device, I found that the app was unable to use the IETF QUIC protocol.

I have tested the YouTube TV webpage and a test app on my own server, which advertises h3 via the Alt-Svc header in response, and monitored the network activity with Wireshark. Neither works on QUIC, but TLS 1.3 over TCP. It only uses gQUIC Q046 when playing YouTube videos.

I also tested the official YouTube TV app. It works perfectly fine on IETF QUIC version 1.

I noticed the IETF QUIC support is mentioned in the CHANGELOG. Is it disabled by default? If so, how do I enable that?

Thank you.

[Kaido Kert]

Hi,

Whether HTTP/3 and QUIC is enabled for any platform for Cobalt is determined at runtime. There is a configuration API, commandline flag and runtime settings to control its behavior.

Please have a look here: https://github.com/youtube/cobalt/blob/25.lts.1%2B/cobalt/network/url_request_context.cc#L232

The config API disables it by default on Android.

Youtube apps configure it at the app start, depending on several factors.

Kaido

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[Kaido Kert]

Apologize  the second code link for config API is here: 

https://github.com/youtube/cobalt/blob/25.lts.1%2B/starboard/android/shared/configuration.cc#L41

Kaido

[Goshin John]

Hi Kaido,

Thanks for the quick response! I actually tried that QUIC setting before, but it didn’t work. It seems to be intended for gQUIC.

While browsing the PRs on GitHub, I found a relevant h5vcc setting here: https://github.com/youtube/cobalt/pull/3541

With it, I can now enable HTTP3 on the JS side using:

window.h5vcc.settings.set("HTTP3", 1);


However, I couldn’t find a corresponding command-line argument. Is there a way to enable it by default in Starboard or via a command-line flag?