HTTP/2 Protocol Support

[Dan Dubois]

Does App Engine support the HTTP/2 protocol?

[Greg Jones]

It does. 

You can install this chrome-extension (https://chrome.google.com/webstore/detail/spdy-indicator/mpbpobfflnpcgagjijhmgnchggcjblin ) and it will show if you're connected to a site with anything other than plain-old-http.

If you check it when on, say, https://apprtc.appspot.com/ it should add a blue icon in the URL-bar and show "HTTP/2 enabled (h2-14)". green means SPDY (appspot.com showed this until recently. you can see it now on twitter.com). When it's red that means "quic" is involved.

[Dan Dubois]

Wow. That's great! Interesting that https://*.appspot.com shows HTTP/2 and when I run it through CloudFlare it shows SPDY/3.1.

[Alexander Trakhimenok]

For some reason it does not show HTTP/2 or SPDY support on my app that use plain HTTP (no HTTPS).

Is it intended behavior? How I can make our websites (hosted on custom domains) to use HTTP/2?

Alex

[Qian Qiao]

Use https. Although technically http/2 supports unencrypted transfer, I don't think anybody implemented it.

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[Alexander Trakhimenok]

Not an option for us - we have too many domains linked to the app and costs for acquiring SSL certificates would be prohibitive.

[Qian Qiao]

On Sat, 21 Mar 2015 at 15:04 Alexander Trakhimenok <alexander....@gmail.com> wrote:

Not an option for us - we have too many domains linked to the app and costs for acquiring SSL certificates would be prohibitive.

Even if you can find the server software that runs http/2 without tls, the browsers may not work. I'm not sure about chrome, but Firefox for example, has explicitly stated that they will only support http2 over tls.

-- Joe

[Michael Spainhower]

Not sure if they have a limit on number of certs you can request, but https://www.startssl.com/?app=1 may be an options for you.