text: #standardSQL
  # 04_09b: Top Accept-CH
  SELECT
    client,
    chHTML,
    chHeader,
    count(0) hits
  FROM
  (
    SELECT
      client,
      page,
      replace(regexp_extract(regexp_extract(body, r'(?is)<meta[^><]*Accept-CH\b[^><]*'), r'(?im).*content=[&quot;#32"\']*([^\'"><]*)'), "#32;", '') chHTML,
      regexp_extract(regexp_extract(respOtherHeaders, r'(?is)Accept-CH = (.*)'), r'(?im)^([^=]*?)(?:, [a-z-]+ = .*)') chHeader
    FROM `httparchive.almanac.summary_response_bodies`
    WHERE firstHtml
      AND ( regexp_contains(body, r'(?is)<meta[^><]*Accept-CH\b')
      OR regexp_contains(respOtherHeaders, r'(?is)Accept-CH = ') )
  )
  GROUP BY
    client,
    chHTML,
    chHeader
  ORDER BY
    client DESC, hits DESC