debug:flask
Flask Debugging Guide
A systematic approach to debugging Flask applications using established patterns and Flask-specific tooling.
Common Error Patterns
HTTP Status Code Errors
404 Not Found - Routing Issues
- Route decorator not matching requested URL
- Typos in route definitions or endpoint names
- Blueprint not registered with application
- Missing trailing slash mismatch (
strict_slashessetting) - URL rules registered after first request
500 Internal Server Error
- Unhandled exceptions in view functions
- Template rendering errors
- Database connection failures
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