Reproduction

1. Create a remix app
2. Run build then start
3. Open the page
4. Check the headers on the /favicon.ico request

The favicon from /public comes with Cache-Control: public, max-age=31536000, immutable

System Info

remix 2.9.1

Used Package Manager

npm

Expected Behavior

The server config from
https://github.com/remix-run/remix/blob/main/packages/remix-serve/cli.ts
says app.use(express.static("public", { maxAge: "1h" }));.
So it is expected to have maxAge=1h

Actual Behavior

We actually get an immutable maxAge=1y