Resolved 422 Error in FastAPI with File Handling

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📅 2025-04-12 — Session: Resolved 422 Error in FastAPI with File Handling

🕒 01:20–01:50
🏷️ Labels: Fastapi, Error Handling, Api Development, Frontend, Backend
📂 Project: Dev
⭐ Priority: MEDIUM

Session Goal

The primary aim of this session was to diagnose and resolve a 422 Unprocessable Entity error occurring in a FastAPI application due to incorrect file handling in API requests.

Key Activities

  • Error Diagnosis: Identified that the error was caused by sending a file path instead of file content in the POST request.
  • Frontend Fixes: Updated the frontend to correctly send the file path in the payload, ensuring compatibility with the backend.
  • Backend Adjustments: Modified the FastAPI backend to accept both text and path inputs in the Pydantic model, improving error handling and functionality.
  • Strategy Evaluation: Evaluated different strategies for file handling in API development, deciding on a default approach for local development.
  • Flow Integration: Implemented a flow execution feature in the Code Review Page using React and TypeScript.
  • Code Analysis: Analyzed the runFlow function for potential improvements in error handling and performance.

Achievements

  • Successfully resolved the 422 Unprocessable Entity error by aligning frontend and backend processes.
  • Improved the robustness of the FastAPI application by refining the FlowRequest model.
  • Enhanced the code review process with new flow execution capabilities.

Pending Tasks

  • Further testing of the new file handling strategy in different environments.
  • Continuous monitoring and optimization of the runFlow function for better performance.

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