npm registry api path: GET ./{package}/{version} doesn't work - returns 405

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The npm registry api supports the following request: GET ./{package}/{version}. See https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#getpackageversion. However when I call this I get a 405:
curl -i -H "Authorization: Bearer ghp_XXXXXXXXXXXXXXXXXXX" https://npm.pkg.github.com/@my-scope/my-pkg/1.9.0.
Is this going to be supported?