www redirect doesn't work on spinx-doc.org when using HTTPS

[Calinou]

Describe the bug

When browsing https://sphinx-doc.org/, it fails to load the page as it doesn't redirect to https://www.sphinx-doc.org/. In contrast, browsing http://sphinx-doc.org/ (HTTP instead of HTTPS) will redirect to https://www.sphinx-doc.org/.

To Reproduce

Open https://sphinx-doc.org/ in a Web browser.

Expected behavior

https://sphinx-doc.org/ should redirect to https://www.sphinx-doc.org/.

Your project

N/A

Screenshots

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Environment info

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