Enable HTTP/2 support in Chrome

Mattias Geniar, Monday, January 12, 2015 - last modified: Wednesday, February 25, 2015

I actually thought HTTP/2 was enabled by default in Chrome, but as it turns out there's a special flag (via a GUI) you still need to set.

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How to enable HTTP/2 -- SPDY4 in Chrome

Go to the chrome://flags page (I can't link to it directly, as the browser won't allow direct links to the settings page) in your Chrome browser. Search for HTTP/2. Find the option called Enable SPDY/4.


Next, restart Chrome and SPDY4 will be enabled. This is one of the earlier drafts of HTTP/2 (at the time of writing, HTTP/2 draft 14) that will now be enabled. If you're using Firefox 36 or higher, HTTP/2 support is fully baked in and enabled by default.

If you're running Chromes nightly "canary" build, you can view the Protocol used in the Network Tab. Even though the SPDY-HTTP2 option is disabled by default, the before and after protocols are exactly the same: h2-14.

It may just be that Google has different settings for its own domains, that have hard-coded HTTP/2 support.

Before & after enabling HTTP/2



After enabling SPDY, HTTP/2:


This'll need a bit more testing to be sure.

More on HTTP/2?

Interested in HTTP/2 news? Have a look at some of the following articles.

Hi! My name is Mattias Geniar. I'm a Support Manager at Nucleus Hosting in Belgium, a general web geek & public speaker. Currently working on DNS Spy & Oh Dear!. Follow me on Twitter as @mattiasgeniar.

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jason Wednesday, February 3, 2016 at 19:03 - Reply

On version 47 of chrome it’s not even listed for me. It’s enabled by default on the newer browsers.

nasrallah Thursday, January 26, 2017 at 11:39 - Reply

hi there, i want to activate http2 support on chrome 55 but i can’t find the right setting related to it? any guidance are more than welcome.

Josh Habdas Thursday, February 9, 2017 at 06:36 - Reply

Mattias could you update this post. It seems like the content is expired, and it just chewed up some of my time (and by the looks of it in the comments, some others’ as well). Thanks!

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