With the full header showing 404
$ curl -i -H "User-Agent: Username:ImperfectAge, Email: <removed>" https://api.chess.com/pub/club/uschess
HTTP/2 404
date: Tue, 05 Mar 2024 20:07:06 GMT
content-type: application/json; charset=utf-8
content-length: 173
x-chesscom-matched: pubapi_club_Driver
etag: W/"8b6d437c6abd82c9286a4a94dbe908b3"
link: <https://api.chess.com/context/Exception.jsonld>; type="application/ld+json"
last-modified: Tuesday, 05-Mar-2024 19:53:53 GMT+0000
access-control-allow-origin: *
cache-control: public, max-age=30
expires: Tue, 05 Mar 2024 20:07:23 GMT
x-chesscom-meta: lean=cached
x-chesscom-request-id-lb: 026d02c480fcbfd956512f18cd90d6a6
x-chesscom-request-id-cdn: 85fcbaa789ce711e-IAD
x-chesscom-servedby: 142
strict-transport-security: max-age=63072000; includeSubDomains; preload
cf-cache-status: HIT
age: 13
set-cookie: __cf_bm=lb5SosN.IhS8SKsi44LqibYr2O4JeXUpqRtWIzmHSWc-1709669226-1.0.1.1-Wcc6vTYCuheu6mPj9RdRlB1N4e3R3EQjaXvE5a6Tp_j1hig5dWdENExpp2XlXJyHhlHpTeAEncAvGrG1qdDqv6S6SaP6Y1q7w_ZM_Apwz_k; path=/; expires=Tue, 05-Mar-24 20:37:06 GMT; domain=.chess.com; HttpOnly; Secure; SameSite=None
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=MCLZFCN7LMOmuwtyLrkMu6KmD6dI%2F78rTQR9P%2F0aVFqQ%2BPhIoEdDE3qfLpH0gI9xfE9HYH1dDnTBK4jRuSEm%2BXSx5YSlT%2Bq%2FA3ajjvv57iu78Rfpo3NCtIKMeoxP05g%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":1,"report_to":"cf-nel","max_age":604800}
server: cloudflare
cf-ray: 85fcbaf7ed155709-DUB
alt-svc: h3=":443"; ma=86400
{"code":0,"message":"An internal error has occurred. Please contact Chess.com Developer's Forum for further help https://www.chess.com/club/chess-com-developer-community ."}
This one, for example https://api.chess.com/pub/club/uschess (US Chess on chess.com)
$ curl https://api.chess.com/pub/club/uschess
{"code":0,"message":"An internal error has occurred. Please contact Chess.com Developer's Forum for further help https://www.chess.com/club/chess-com-developer-community ."}
Specifying the user agent does not help:
curl -H "User-Agent: Username:ImperfectAge, Email:.... " https://api.chess.com/pub/club/uschess
Same error.