Formal suggestion: The error this code is usually caused by an invalid request often masks deeper issues.
1. Enable debug mode if the API supports it.
2. Check for CORS misconfigurations—sometimes preflight requests fail silently.
3. Test with curl to isolate the problem:
```curl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' https://api.example.com```
1. Enable debug mode if the API supports it.
2. Check for CORS misconfigurations—sometimes preflight requests fail silently.
3. Test with curl to isolate the problem:
```curl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' https://api.example.com```