---
phase: 10.1-aggressive-workflow-modularization
plan: 08
subsystem: workflows
tags: [n8n, docker-api, error-handling, status-codes]

# Dependency graph
requires:
  - phase: 10.1-01
    provides: "Container Actions sub-workflow (n8n-actions.json)"
provides:
  - "HTTP status code detection in container action formatters (304, 404, 500+)"
  - "User-friendly messages for already-stopped/started containers"
  - "Clear error messages for not-found and server errors"
affects: [UAT-gap-closure, Phase-11-updates]

# Tech tracking
tech-stack:
  added: []
  patterns: ["HTTP status code handling before message-based fallback", "Docker API 304 = already in desired state"]

key-files:
  created: []
  modified: ["n8n-actions.json"]

key-decisions:
  - "Status code checks run before existing message-based checks (fail-fast pattern)"
  - "HTTP 304 treated as success with helpful 'already {state}' message"

patterns-established:
  - "Docker API status code interpretation: 304=already-in-state, 404=not-found, 500+=server-error, 204=success"
  - "onError:continueRegularOutput allows Format nodes to inspect statusCode field"

# Metrics
duration: 1min 34sec
completed: 2026-02-08
---

# Phase 10.1 Plan 08: Container Action Status Code Handling Summary

**Docker API HTTP status code detection (304, 404, 500+) added to Stop/Start/Restart result formatters, providing clear user feedback for edge cases**

## Performance

- **Duration:** 1 min 34 sec
- **Started:** 2026-02-08T14:53:11Z
- **Completed:** 2026-02-08T14:54:45Z
- **Tasks:** 2
- **Files modified:** 1

## Accomplishments
- Added statusCode handling to all three Format Result nodes (Stop, Start, Restart)
- HTTP 304 now returns success with "already stopped/started" message instead of failure
- HTTP 404 returns clear "Container not found" error message
- HTTP 500+ returns descriptive "Server error {action}" message
- Deployed updated sub-workflow to n8n instance successfully

## Task Commits

Each task was committed atomically:

1. **Task 1: Add statusCode checks to Format Stop/Start/Restart Result nodes** - `684feb1` (feat)
2. **Task 2: Deploy updated sub-workflow via n8n API** - *(API operation, no file changes)*

## Files Created/Modified
- `n8n-actions.json` - Added HTTP status code handling to Format Stop/Start/Restart Result Code nodes

## Decisions Made

**Status code checks before message-based fallback:** Implemented statusCode checks first, then fall through to existing message/error field checks. This ensures Docker API HTTP responses are handled explicitly before relying on message parsing.

**HTTP 304 as success:** Docker API returns 304 when container is already in desired state (e.g., stopping an already-stopped container). Treating this as `success: true` with helpful message instead of error provides better UX.

**Per-action messaging:** Each formatter uses action-appropriate text:
- Stop: "already stopped"
- Start: "already started"
- Restart: "already started" (Docker restart endpoint returns 304 for running containers)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None - implementation was straightforward.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

UAT gap "Stopping an already-stopped container shows failure message" is now closed. The fix is deployed and ready for UAT verification.

All gap closure plans (08-09) will be complete after Plan 09 execution.

## Self-Check: PASSED

**Created files verification:**
- SUMMARY.md: Created in this execution

**Modified files verification:**
```
[ -f "/home/luc/Projects/unraid-docker-manager/n8n-actions.json" ] && echo "FOUND: n8n-actions.json" || echo "MISSING: n8n-actions.json"
FOUND: n8n-actions.json
```

**Commits verification:**
```
git log --oneline | head -5
684feb1 feat(10.1-08): add statusCode handling to container action result formatters
0fc429f docs(10.1): create UAT gap closure plans (08-09)
a1705e0 test(10.1): diagnose 4 UAT issues with root causes
e369fe5 test(10.1): complete UAT - 11 passed, 4 issues
b8ae532 docs(10.1): mark Phase 10.1 complete in roadmap (7/7 plans)
```

All commits present. All files exist.

---
*Phase: 10.1-aggressive-workflow-modularization*
*Completed: 2026-02-08*