[Bug]: --base-url option seems to be non-working

[mikaello]

Steps to reproduce

When adding the --base-url I expect this to be used instead of the default base URL, and if I use a non-working --base-url I expect the download to fail (to verify that the option is actually used).

Non-working base URL, expected to fail (but works): npx @puppeteer/browsers install --base-url https://example.com chrome@stable

I am working in an airgapped environment, so I got a proxy on my side (which I have verified working locally by cURL-ing the URL), example with redacted host:

$ curl -I https://nexus.company.com/googleapis-storage-external/chrome-for-testing-public/125.0.6368.2/linux64/chrome-linux64.zip`
HTTP/1.1 200

But this does not work when using it with the --base-url option (it still uses the default base URL): npx @puppeteer/browsers install --base-url https://nexus.company.com/googleapis-storage-external/chrome-for-testing-public chrome@stable.

I have also tested the same things with the PUPPETEER_DOWNLOAD_BASE_URL env set to the correct proxy, and to a failing proxy, e.g. PUPPETEER_DOWNLOAD_BASE_URL=https://example.com with the same result.

Expected results

Expects:

• npx @puppeteer/browsers install --base-url https://example.com chrome@stable should fail because of invalid base URL
• npx @puppeteer/browsers install --base-url https://nexus.company.com/googleapis-storage-external/chrome-for-testing-public chrome@stable (redacted host) should work and use the specified base URL

Also expects the same resuts by substituting the --base-url option with PUPPETEER_DOWNLOAD_BASE_URL.

Actual results

Whatever I specify in --base-url, the default base URL is used, it does not fail when inserting invalid base URLs, and it does not succeed when using valid base URLs in air-gapped environments.

Base URL option and version used:

$ npx @puppeteer/browsers install --help  | grep base-url
  --base-url  Base URL to download from  [string]
$ npx @puppeteer/browsers install --version
2.2.0