[Bug?]: repo.yarnpkg.com returns 404 errors for HEAD requests

[risu729]

Self-service

• I'd be willing to implement a fix

Describe the bug

HEAD requests to repo.yarnpkg.com are rejected by the server, which returns a 404 error even though GET requests work fine.

To reproduce

$ curl --head https://repo.yarnpkg.com/4.9.2/packages/yarnpkg-cli/bin/yarn.js
HTTP/2 404
date: Sun, 27 Jul 2025 01:13:52 GMT
content-type: text/plain;charset=UTF-8
content-length: 9
access-control-allow-origin: *
server: cloudflare
cf-ray: 965846d68f4b9883-KIX

$ curl --head https://repo.yarnpkg.com/tags
HTTP/2 404
date: Sun, 27 Jul 2025 01:10:12 GMT
content-type: text/plain;charset=UTF-8
content-length: 9
access-control-allow-origin: *
server: cloudflare
cf-ray: 9658417ae83b00d3-KIX

Environment

System:
    OS: Linux 6.6 Ubuntu 24.04.2 LTS 24.04.2 LTS (Noble Numbat)
    CPU: (16) x64 AMD Ryzen 7 PRO 8840U w/ Radeon 780M Graphics
  Binaries:
    Node: 24.4.1 - /tmp/xfs-124c6b92/node
    Yarn: 4.9.2 - /tmp/xfs-124c6b92/yarn
    npm: 11.4.2 - ~/.local/share/mise/installs/node/24.4.1/bin/npm
    pnpm: 10.13.1 - ~/.local/share/mise/installs/pnpm/10.13.1/pnpm
    bun: 1.2.19 - ~/.local/share/mise/installs/bun/1.2.19/bin/bun

Additional context

I found this while looking at jdx/mise#5745.
mise uses HEAD requests to verify if the URL exists before downloading the files.