firebase serve is serving http1.1 not http2

[maxwell8888]

[REQUIRED] Environment info

firebase-tools: 8.9.0

Platform: macOS high sierra version 10.13.6

[REQUIRED] Test case

firebase serve

[REQUIRED] Steps to reproduce

Run firebase init to create a basic project using default settings and then run firebase serve. All resources are served as http1.1, however firebase hosting is supposed to use http2.

[REQUIRED] Expected behavior

The local development server which is started by firebase serve uses http2.

[REQUIRED] Actual behavior

The local development server which is started by firebase serve uses http1.1.

[samtstern]

@bkendall is this a known issue with superstatic?

[bkendall]

It would be a superstatic thing. If it were updated to do http2, firebase-tools would pick up that fix. I'm not sure off-hand how difficult it would be, but my guess is that it may be pretty straight forward...

[bkendall]

To set expectations: this is not trivial because HTTP/2 requires encryption, which gives weird user experiences locally. This likely isn't going to be worked on until we can solve that in an elegant way.