[undertow-dev] HTTP/2 with undertow-core 1.2.6.Final?

[Michael Hixson]

Hello,

I'm trying to test out HTTP/2 with undertow-core 1.2.6.Final.  I
haven't been able to see any HTTP/2 traffic to from my server locally,
and I'm not sure what I'm doing wrong.

I mostly followed the example code here:
https://github.com/undertow-io/undertow/blob/master/examples/src/main/java/io/undertow/examples/http2/Http2Server.java

Notably I:
 - Enable the HTTP2 and SPDY server options on my Undertow builder.
 - Am using an HTTPS listener with an SSLContext.
 - Have a maven dependency for org.mortbay.jetty.alpn:alpn-boot:8.1.3v20150130.

But when I make requests in a browser (tried Chrome and Firefox), it
says the protocol for all my requests is HTTP/1.1.  I know at least
Chrome supports HTTP2 because I can see it using HTTP2 in that very
same browser console - other resources loaded by that same page on my
website (e.g. to Google Analytics) are delivered *not* over HTTP/1.1.

Has anyone been able to use HTTP/2 with Undertow on localhost
successfully?  Any ideas what I might be doing wrong?

I'm using a self-signed certificate, if that matters.  I also tried
the keystores in the examples directory on Github and got the same
result.  Thinking something else in my app was interfering with this,
I also tried a root HttpHandler that simply wrote "hello" to the
output stream for every response.  No success there either.

My apologies if this is me not understanding HTTP/2 rather than any
Undertow-specific thing.

-Michael