/favicon.png, /apple-touch-icon.png and /logo.svg are kept a day under
fixed names, so after the new logo went out, curl through the tunnel and
browsers still got the old one. The pages now ask for them as
/favicon.png?v=<hash>, the way they already ask for app.js and app.css,
so a changed icon is a new URL for every cache on the way. /favicon.ico
cannot carry a query, as browsers ask for it on their own; it keeps the
day.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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