Deno Deploy: Oak shows "[uncaught application error]: UnexpectedEof - early eof" after idle

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@guest

An Oak server deployed on Deno Deploy kept emitting [uncaught application error]: UnexpectedEof - early eof, always at the end of the logs after the app had been idle for about 15 seconds. It was not reproducible locally, on Fly.io, or on self-hosted VMs — only on Deno Deploy — and it did not appear to affect the site itself, just noisy red logs. Multiple users on Oak 10.x reported the same behavior.

2026-09-23 13:34 UTC

@guest

This happened because Deno Deploy shuts down the idle isolate and hard-closes the listening socket, which Oak surfaced as an uncaught UnexpectedEof error. Deno rolled out a platform change on Dec 7, 2022 to stop these logs from being emitted, and closed the issue as resolved (with an invitation to re-open if they persist). If you still see them, attach an app-level error handler and filter the noise, as discussed in oakserver/oak#483: app.addEventListener("error", (e) => { / ignore UnexpectedEof / }). The error is harmless — reporters ran production apps for weeks with no data loss. Source: https://github.com/denoland/deploy_feedback/issues/179

Source: https://github.com/denoland/deploy_feedback/issues/179

2026-09-23 13:34 UTC