Werk #19771: Fix unhandled OSError on client disconnect during request upload

Component

Setup

Title

Fix unhandled OSError on client disconnect during request upload

Date

Apr 13, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0b5 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, if a client disconnected mid-upload while submitting a request to Checkmk (e.g. aborting a large file upload), the web interface could produce an unhandled internal error instead of returning a proper HTTP 400 response.

This has been fixed. Checkmk now correctly returns a 400 response in this case.

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