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It doesn't include appengine, but it enables appengine flex to one day support it.

Also FYI Appengine Flex does support HTTP2 Server Push. You just got to do the following:

Set Headers to: Content-Type: text/event-stream

Cache-Control: no-cache

Connection: keep-alive

And use your favorite http2 server push framework.

What you showed in your example is Server-Sent Events, not HTTP2 Server Push.

It does work really well but is unsupported on IE.

Sever push is really a different use case from web sockets. It's also an optional part of the HTTP/2 protocol, no guarantee of client support.

Also SSE has been around for a decade or so, not to be confused with HTTP/2 push.

This is really useful, thanks to provide this.

According to the docs this is not yet supported on the App Engine Flexible product[1]