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Backend Fixes and Improvements

Changes Made to Ensure Backend Receives Frontend Requests

1. Enhanced CORS Handling

  • ✅ Added explicit OPTIONS handler for all endpoints
  • ✅ Proper CORS headers in OPTIONS responses
  • ✅ Origin-based CORS header setting

2. Improved Request Parsing

  • ✅ Added force=True to request.get_json() to handle edge cases
  • ✅ Fallback to form data if JSON parsing fails
  • ✅ Added request logging for debugging

3. Enhanced Error Handling

  • ✅ Better error messages
  • ✅ Request logging for troubleshooting
  • ✅ Proper error responses with CORS headers

4. Updated Endpoints

/api/health (GET, OPTIONS)

  • Now supports OPTIONS for CORS preflight
  • Returns users_file path in response

/api/auth/register (POST, OPTIONS)

  • Enhanced OPTIONS handler with proper CORS headers
  • Added request logging
  • Improved JSON parsing with fallback
  • Better error handling

/api/auth/login (POST, OPTIONS)

  • Enhanced OPTIONS handler
  • Added request logging
  • Improved JSON parsing

Testing the Backend

Manual Test Steps:

  1. Start the backend:

    cd backend
python app.py

  2. Test health endpoint in browser:

  3. Test registration endpoint:

    • Open browser DevTools (F12)
    • Go to Console tab
    • Run:
    fetch('http://localhost:5001/api/auth/register', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Origin': 'http://localhost:3000'
  },
  body: JSON.stringify({
    email: 'test@example.com',
    password: 'test123456',
    name: 'Test User',
    role: 'student'
  })
})
.then(r => r.json())
.then(console.log)
.catch(console.error)

  4. Check backend console:

    • You should see logs like:
      • "Register request received from: ..."
      • Request headers
      • Request method
      • Content-Type

Common Issues and Solutions

Issue: "Network Error: Unable to connect"

Solution:

  1. Ensure backend is running: python backend/app.py
  2. Check port 5001 is not blocked by firewall
  3. Verify backend is accessible: http://localhost:5001/api/health

Issue: CORS errors in browser

Solution:

  • Backend now handles CORS properly
  • Check browser console for specific CORS errors
  • Ensure frontend is using correct Origin header

Issue: "400 Bad Request"

Solution:

  • Check request format in browser DevTools → Network tab
  • Verify Content-Type is application/json
  • Check request payload is valid JSON

Backend Logs

The backend now logs:

  • Incoming request IP address
  • Request headers
  • Request method
  • Content-Type
  • Any errors with full traceback

Check the terminal where backend is running for these logs.

Next Steps

  1. Restart the backend to apply all changes:

    # Stop current backend (Ctrl+C)
cd backend
python app.py

  2. Restart the frontend to ensure it picks up changes:

    # Stop current frontend (Ctrl+C)
cd frontend/complain-analyzer-ai
npm run dev

  3. Test the signup page:

    • Go to: http://localhost:3000/register
    • The page will automatically check backend connection
    • Try signing up with test data
    • Check browser console (F12) for detailed logs
    • Check backend terminal for request logs

Verification Checklist

  • Backend is running on port 5001
  • http://localhost:5001/api/health returns JSON response
  • Backend terminal shows startup messages
  • Frontend can detect backend connection
  • Signup form is enabled (not disabled)
  • Browser console shows API requests
  • Backend terminal shows request logs when form is submitted