DEBUG_ERROR.md

# Debugging the D1_TYPE_ERROR

## Understanding the Error

The error `"Internal error: D1_TYPE_ERROR: Type 'object' not supported for value '[object Object]'"` is coming from the **quiz page backend** (likely Cloudflare D1 database), not from our server.

This suggests:
1. ✅ Our server is working correctly
2. ✅ The request is reaching the quiz page
3. ❌ The quiz page backend is rejecting our answer format

## Possible Causes

### 1. Wrong URL
You're using: `https://tds-llm-analysis.s-anand.net/demo`

This is a **demo endpoint**, not a quiz page. You need to:
- Go to the actual quiz page first
- Get the quiz page URL
- Use that URL in your request

### 2. Answer Format Issue
The quiz page might expect:
- A simple string instead of a JSON object
- A specific JSON structure
- A different data type

### 3. Quiz Page Backend Issue
The quiz page's database (D1) might have issues with:
- Complex nested objects
- Certain data types
- The way we're serializing the answer

## How to Debug

### Step 1: Check Server Logs

When you run the server, you should see detailed logs:
```powershell
python -m app.main
```

Look for:
- "Submitting answer to: ..."
- "Payload: ..."
- "Response status: ..."
- "Error response: ..."

### Step 2: Test with a Simple Answer

Try submitting a simple string answer first:

```powershell
# Test with simple answer
$body = @{
    email = "24f2005753@ds.study.iitm.ac.in"
    secret = "EasyQuiz"
    url = "https://tds-llm-analysis.s-anand.net/demo"
} | ConvertTo-Json

# But wait - you need the actual quiz page URL, not the demo endpoint!
```

### Step 3: Verify the Quiz Page URL

The URL should be:
- A quiz page (like `https://tds-llm-analysis.s-anand.net/quiz/123`)
- NOT the demo endpoint (`/demo`)

### Step 4: Check What the Quiz Page Expects

1. Open the quiz page in a browser
2. Look at the page source
3. Find the submit URL
4. Check what format the answer should be in

## Quick Fixes to Try

### Fix 1: Use Correct URL
```powershell
# Get the actual quiz page URL first
# Then use that URL, not the demo endpoint
$body = @{
    email = "24f2005753@ds.study.iitm.ac.in"
    secret = "EasyQuiz"
    url = "https://tds-llm-analysis.s-anand.net/actual-quiz-page"  # Change this!
} | ConvertTo-Json
```

### Fix 2: Check Server Response
The server now logs more details. Check the terminal where `python -m app.main` is running to see:
- What payload is being sent
- What response is received
- Any error details

### Fix 3: Test with curl for Better Error Messages
```powershell
curl.exe -X POST http://127.0.0.1:8000/demo `
  -H "Content-Type: application/json" `
  -d '{\"email\":\"24f2005753@ds.study.iitm.ac.in\",\"secret\":\"EasyQuiz\",\"url\":\"https://tds-llm-analysis.s-anand.net/demo\"}' `
  -v
```

The `-v` flag shows verbose output including headers and response details.

## What I've Fixed

I've updated the code to:
1. ✅ Better error handling in `_submit_answer`
2. ✅ More detailed logging
3. ✅ Better JSON serialization handling
4. ✅ Logs the full payload and response

## Next Steps

1. **Check the server logs** when you make the request
2. **Verify you're using the correct quiz page URL** (not the demo endpoint)
3. **Look at the detailed error in the logs** to see what the quiz page is rejecting
4. **Try with a simpler answer format** if the logs show serialization issues

## Expected Behavior

When working correctly:
1. Server loads the quiz page
2. Extracts the question
3. Solves it
4. Finds the submit URL
5. Submits the answer
6. Returns the response

The error you're seeing happens at step 5 - the quiz page backend is rejecting our submission.