Wrong login in dev mode causes 502 error

[JustOxlamon]

Description

Wrong login or password in dev mode causes 502 error (bad gateway), while backend sends 401.

Frontend log: fetch failed: Error: expected non-null body source

Steps to Reproduce

1. Try to wrong login
2. Frontend failed with error: 'api offline'

Expected Behavior

Expected toast or popup window with error: 'Invalid username or password.'

Actual Behavior

Frontend failed with error: 'api offline'

Environment

• Windows 11
• Docker desktop 4.70.0

Logs / Screenshots