Spec: Styled 404 Error Page
Task ID: dec65421-e6db-4ef8-a9ef-dbbc2a8b6be8
Priority: P88
Layer: [UI]
Goal
Replace raw JSON 404 responses with a styled HTML page for browser requests. API requests continue to get JSON.
Acceptance Criteria
☑ Browser requests to non-existent pages get styled 404 page
☑ API requests (Accept: application/json or /api/* paths) still get JSON
☑ 404 page shows SciDEX branding with gradient heading
☑ Navigation links to main pages (Dashboard, Exchange, Analyses, Wiki, Graph, Demo)
☑ Shows requested path for debugging
Work Log
2026-04-02 11:40 PT — Slot 11
- Added @app.exception_handler(404) with HTML/JSON branching
- Styled page with gradient 404 heading, helpful links, requested path display
- Verified syntax
2026-04-20 00:45 PT — Slot 12 (Verify)
Already Resolved — 2026-04-20T00:45:00Z
Evidence: Inspected origin/main:api.py — @app.exception_handler(404) with HTML/JSON branching is present at lines covering styled 404 page with gradient heading, navigation links (Dashboard, Exchange, Analyses, Wiki, Graph, Demo), and requested path display.
Commit that landed it: ae48a90ceb7685bef717bd7e426e1af4628a8cf3
Summary: Already addressed by prior commit; handler is live on main.