HTTP/2 Adoption

Announced Support

Sites indicate which application-layer protocols they support using NPN/ALPN. If a site indicates HTTP/2, we call this announced support. more...

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Partial Support

Some sites that announce HTTP/2 support immediately downgrade the connection to HTTP 1.1 if a client makes a request using HTTP/2. If a site responds using HTTP/2, even just to return an error page or redirect, we classify this as partial support.

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True Support

If a site actually serves page content using HTTP/2, even if some embedded objects are still served over HTTP 1.1, we call this true support.

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Support by Time   Announced Support Partial Support True Support

Notable Events

  • 2016-05-04    Wikipedia enables HTTP/2
  • 2016-05-03    Blogspot enables HTTP/2
    Google enables HTTPS (and HTTP/2) for all blogspot domain blogs.

    https://security.googleblog.com/2016/05/bringing-https-to-all-blogspot-domain.html
  • 2015-12-16    We update measurement methodology
    We update our Phase 1 measurements to include the Server Name Indication (SNI) TLS extension when we probe sites for HTTP/2 support. Without the SNI set, some HTTP/2 sites (e.g., those using virtual hosts) do not indicate HTTP/2 support in their ALPN responses. We found around 60,000 such sites, of which almost 40,000 truly support HTTP/2.
  • 2015-12-09    We update measurement methodology
    We improve our measurement methodology by testing www.domain.com in addition to domain.com. We discovered that some sites redirect https://domain.com to http://domain.com (served with HTTP 1.1), while https://www.domain.com is served over HTTP/2. We found around 2500 such sites.
  • 2015-12-03    CloudFlare enables HTTP/2
    CloudFlare enables HTTP/2 for all its customers using a modified version of nginx, cloudflare-nginx.

    https://blog.cloudflare.com/introducing-http2/
  • 2015-10-03    WordPress enables HTTP/2
    WordPress updates to nginx 1.9.5, which introduces HTTP/2 support. nginx support for HTTP/2 was sponsored by Dropbox and Automattic, the creators of WordPress.

    http://nginx.org/en/CHANGES
  • 2015-09-11    We expand list of monitored sites
    We periodically refresh the list of sites we monitor with the most recent Alexa top 1 million list. We do not remove old sites that no longer appear on the Alexa list, so our list grows when we do this.

    More information
  • 2015-08-06    We expand list of monitored sites
    We periodically refresh the list of sites we monitor with the most recent Alexa top 1 million list. We do not remove old sites that no longer appear on the Alexa list, so our list grows when we do this.

    More information
  • 2015-06    Hawk Host enables HTTP/2
    The number of partial support websites—though they are mostly error pages—triples from 600 to 2,000 when Hawk Host, a virtual web hosting provider, updates its servers to the latest version of LiteSpeed, which supports H2.

    http://blog.hawkhost.com/2015/07/13/http2-more-now-available-at-hawk-host-via-litespeed-5-0/
  • 2015-01-10    Google re-enables HTTP/2
    Google re-enables HTTP/2 after the SDCH compression issue is patched.
  • 2014-12-18    Google disables HTTP/2
    Google, the primary adopter of H2 at this time, disabled H2 support on their servers due to an issue with SDCH compressed content in Chromium. It takes three weeks for the problem to be fixed.

    https://lists.w3.org/Archives/Public/ietf-http-wg/2014OctDec/0960.html

Support by Server   True Support

Support by Country   True Support

Support by Organization   True Support

Organization # Domains