Resolved FastAPI 404 and CORS Issues

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📅 2025-04-17 — Session: Resolved FastAPI 404 and CORS Issues

🕒 02:40–03:37
🏷️ Labels: Fastapi, CORS, Debugging, API, YAML
📂 Project: Dev
⭐ Priority: MEDIUM

Session Goal

The session aimed to resolve persistent 404 errors and CORS issues in a FastAPI application, ensuring all API endpoints are correctly configured and accessible.

Key Activities

  • 404 Error Fix: Identified incorrect router declarations causing 404 errors on the /api/run_flow endpoint and implemented solutions to correct these issues.
  • CORS Configuration: Provided a detailed guide on configuring CORS middleware in FastAPI, including server restart instructions and debugging tips.
  • Endpoint Verification: Confirmed active API endpoints and ensured the /api/run_flow route was successfully registered.
  • YAML Editor Feedback: Collected and synthesized user feedback on the YAML Editor pane, identifying UX improvements.
  • Monaco Integration: Updated the YamlEditor component with Monaco editor features, such as dirty state tracking and controlled content updates.

Achievements

  • Successfully resolved the 404 error by correcting router declarations.
  • Configured CORS middleware to resolve cross-origin issues.
  • Verified the correct setup of API endpoints in the FastAPI backend.

Pending Tasks

  • Further UX improvements based on user feedback for the YAML Editor pane.
  • Continuous monitoring of API routes to ensure stability and performance.

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