Werk #18991: Fix status codes on ajax calls

Component

User interface

Title

Fix status codes on ajax calls

Date

Mar 31, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

3.0.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0b3	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, when an AJAX request triggered an error (e.g. due to an unauthenticated request), the server always responded with 200 OK containing a JSON error body like:

{"result_code": 1, "result": "Not authenticated: You are not authenticated.", "severity": "error"}

This caused AJAX error handlers that check HTTP status codes to not trigger, resulting in the raw JSON being rendered in the UI instead of proper error handling.

The server now returns the correct HTTP status code (e.g. 401 for unauthenticated requests) alongside the JSON error body.

To the list of all Werks