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Why a missing JavaScript file can stay missing after you deploy it

This story is from 2026-10-03. It is preserved in the archive; the latest stories are on the live feed.

I built cachewhy around a small but costly HTTP cache mistake. Imagine a request for /missing.js that returns 404 with Cache-Control: public, max-age=2678400 . That lifetime is 31 days. A browser may reuse the missing response even after the file is deployed. Changing the server header helps new re…

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  1. 2026-10-03 03:07 · DEV Community — AI
    Why a missing JavaScript file can stay missing after you deploy it

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