What is the adoption of Client Hints on the web?

Analysis
1

Another bounty question… :slight_smile:

Which sites / services make use of Client Hints?

There’s a few ways to detect use of CH: we can look for the opt-in via Accept-CH header or equivalent meta element; we can look at Chrome’s feature counters that log use of CH.

2

There are only 16 domains serving Accept-CH headers.

SELECT
  DISTINCT NET.REG_DOMAIN(url)
FROM
  `httparchive.requests.2018_07_15_desktop`
WHERE
  JSON_EXTRACT(payload, '$._headers.response') LIKE '%Accept-CH: %'
domain
basecamp.com
pinoytrendingnews.net
retours.eu
adbetnet.com
peabbostad.se
eurostarshotels.com
m2ch.hk
sovets24.ru
svadbavo.ru
vrachmedik.ru
pekao.com.pl
sovets.net
games.ch
vogue.com.tw
booking-channel.com
creative.com

And there are 4817 origins that have a feature counter with the CH prefix:

SELECT
  url
FROM
  `httparchive.pages.2018_07_15_desktop`
WHERE
  JSON_EXTRACT(payload,
    '$._blinkFeatureFirstUsed.Features') LIKE '%ClientHints%'

Many of these urls are from softonic.com (turns out we have 4532 origins from this domain, not including other TLDs), so that’s overwhelming the results.

There are 441 unique domains:

SELECT
  Alexa_rank AS rank,
  NET.REG_DOMAIN(url) AS domain
FROM
  `httparchive.pages.2018_07_15_desktop`
LEFT JOIN
  `httparchive.urls.20170315`
ON
  NET.REG_DOMAIN(url) = Alexa_domain
WHERE
  JSON_EXTRACT(payload,
    '$._blinkFeatureFirstUsed.Features') LIKE '%ClientHints%'
GROUP BY
  rank,
  domain
ORDER BY
  rank

Here’s a sheet with all of them in Alexa rank order: