Consider dropping pages with cross-domain redirects

[rviscomi]

While investigating* a high number of origin trials attributed to the google.com origin, I found that we have several thousand pages that immediately redirect to google.com.

For HTTP Archive purposes we don't have any use for additional copies of the google.com page, so these would ideally be discarded. More generally though, if a page redirects, under which conditions should we drop it from the crawl?

There are definitely valid redirects that we should keep, eg example.com to www.example.com, or http to https, both of which are examples of same-domain, cross-origin redirects. But I can't think of many good reasons to keep cross-domain redirects, eg example.com to google.com.

Here's a query that produces some sample pages and their google.com redirect locations:

SELECT
  url,
  header.value AS redirect_location
FROM
  `httparchive.all.requests`,
  UNNEST(response_headers) AS header
WHERE
  date = '2023-06-01' AND
  client = 'mobile' AND
  index = 1 AND
  LOWER(header.name) = 'location' AND
  NET.REG_DOMAIN(header.value) = 'google.com'

url	redirect_location
https://crisistuesdayartillery.com/	https://google.com
https://oautes-tg.su/	https://google.com
https://borderoffenseantenna.com/	https://google.com
https://adversespurt.com/	https://google.com
https://weavelurkwiden.com/	https://google.com
https://favoritenought.com/	https://google.com
http://perryvolleyball.com/	https://google.com
http://tvla.xyz/	https://www.google.com/
http://depositnostrilverge.com/	https://google.com
http://bypasseaseboot.com/	https://google.com
https://mapsplatform.withgoogle.com/	https://www.google.com/maps/about/#!/
https://ww.resgatabonus.club/	https://www.google.com/search?q=noticia
https://dtrack.link/	https://google.com
https://coherencedefinitionupstanding.com/	https://google.com

* For more context on the original issue I was investigating, I'm considering an origin trial token to be invalid if the origin assigned to the token (google.com) doesn't match the host page (page). However, several thousand of these pages appear to have the Origin-Trial headers of google.com but their original page value, causing the tokens to be marked invalid.

[pmeenan]

I was under the impression that the CrUX list is build off of final page URL. If that's the case then any redirects should hopefully be transitional and be flushed out in the next run. That also means that the origin of the test url and the origin of the final url should match and if not then it probably shouldn't be included.

…

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[rviscomi]

The origins in CrUX only assure us that a sufficient number of real users visited pages under those origins, not necessarily their home pages. Some might not have home pages at all, or they might do some weird geo/auth gating.

/ --> /index.html is ok (same-origin)
foo.com --> bar.com is not ok (cross-domain) and hopefully bar.com is in CrUX so we test it anyway
Not so sure about things like example.com --> www.example.com or http to https.

[rviscomi]

Looks like this would affect about 250k pages

SELECT
  (NET.REG_DOMAIN(page) = NET.REG_DOMAIN(url)) IS TRUE AS same_domain,
  COUNT(0) AS pages
FROM
  `httparchive.all.requests`
WHERE
  date = '2023-06-01' AND
  client = 'mobile' AND
  is_main_document
GROUP BY
  same_domain

same_domain	pages
TRUE	30537873
FALSE	242085