10. http2 in Chromium

The Chromium team has implemented http2 and provided support for it in the dev and beta channel for a long time. Starting with Chrome 40, released on January 27th 2015, http2 is enabled by default for a certain amount of users. The amount started off really small and then increased gradually over time.

SPDY support was removed in Chrome 51 in favor or http2. In a blog post, the project announced in February 2016:

“Over 25% of resources in Chrome are currently served over HTTP/2, compared to less than 5% over SPDY. Based on such strong adoption, starting on May 15th — the anniversary of the HTTP/2 RFC — Chrome will no longer support SPDY.”

10.1. First, make sure it is enabled

Enter “chrome://flags/#enable-spdy4" in your browser's address bar and click “enable” if it isn't already showing it as enabled.

10.2. TLS-only

Remember that Chrome only implements http2 over TLS. You will only ever see http2 in action with Chrome when going to https:// sites that offer http2 support.

10.3. Visualize HTTP/2 use

There are Chrome plugins available that helps visualize if a site is using HTTP/2. One of them is “HTTP/2 and SPDY Indicator”.

10.4. QUIC

Chrome's current experiments with QUIC (see section 12.1) dilute the HTTP/2 numbers somewhat.

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