Even non-existent pages return 200 OK http status code

[onnimonni]

Description

All pages return 200 OK no matter what:

$ curl -LsD - https://transitivebullsh.it/non-existent -o /dev/null
HTTP/2 200
age: 240
cache-control: public, max-age=0, must-revalidate
content-type: text/html; charset=utf-8
date: Sat, 17 Feb 2024 11:27:15 GMT
etag: "guocm1p4z382"
server: Vercel
strict-transport-security: max-age=63072000
x-matched-path: /[pageId]
x-powered-by: Next.js
x-vercel-cache: STALE
x-vercel-id: fra1::sfo1::2j9sx-1708169475393-41528da6d980
content-length: 4178