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## Summary
- Add GET method handler to `/api/v1/dify/retrieval` endpoint for Dify
external knowledge base connectivity verification
- GET requests return a simple success response; POST requests retain
existing retrieval logic unchanged
## Problem
When Dify integrates with RAGFlow as an external knowledge base, it
sends periodic GET requests to the retrieval endpoint for
health/connectivity checks. The endpoint only accepted POST, causing
werkzeug to return `405 Method Not Allowed`. After several successful
POST retrievals, the failing GET health checks trigger Dify's circuit
breaker, causing all subsequent requests to fail.
Traceback from the issue:
```
werkzeug.exceptions.MethodNotAllowed: 405 Method Not Allowed: The method is not allowed for the requested URL.
```
## Changes
- `api/apps/sdk/dify_retrieval.py`: Added a separate GET route handler
(`retrieval_health_check`) that returns `get_json_result(data=True)`
## Test plan
- [ ] Verify `GET /api/v1/dify/retrieval` returns `{"code": 0,
"message": "success", "data": true}`
- [ ] Verify `POST /api/v1/dify/retrieval` with valid API key and body
still works as before
- [ ] Verify Dify external knowledge base integration no longer returns
405 errors
Closes #13788
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Asksksn <Asksksn@noreply.gitcode.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>