Hi,
I tried refreshing page many time. HTTP3 is enabled but not working for my domain. (Working for google ads in same browser).
This is presumably a Chrome output. Chrome seems to support H3-23 only in the development builds at this point. Hence you cant use a regular build with HTTP 3 yet.
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sandro,
I am little confused. It seems google ads/youtube/search using
alt-svc: quic=":443"; ma=2592000; v=“46,43”
it seems draft 46 which is working and draft 23 is not working?
The protocol you are referring to seems to be an extended HTTP 2 version with some QUIC aspects. Draft 23 seems to be different.
I cant guarantee that this is the reason, but it would be my understanding that it is. Also, is your Chrome version actually a development build to begin with?
no. I would like to download canary but i don’t know how to use command line in mac.
In this case I am afraid you wont be able to test HTTP 3 yet.
I installed chrome canary. Still the option to enable at command line is difficult to execute on macOS.
Thats something to take up with Google however 
You probably need to enable HTTP 3 and not QUIC, but thats really something that is better suited for a Chrome forum.
And you ran it with both arguments?
No such argument exist.
open ‘/Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary’ --enable-quic --quic-version=h3-23
i tried seeing them via chrome://flags
Well, it requires these arguments. If they do not work you best take that to a Chrome forum.
Finally able to open using command line with required flags.
/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --enable-quic --quic-version=h3-23
Still seeing http2. Now please suggest what should I do.
These flags are not shown in chrome//flags. Make sure you have Chrome Canary v79. I downloaded Chrome Canary from Google’s official site to try outh HTTP/3 and for some reason, Canary v77 was installed.
With --enable-quic --quic-version=h3-23 enabled, you should see the following in Dev tools on HTTP/3-enabled sites:
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