errors

Custom error pages improve user experience and brand consistency. I create templates named 404.html, 500.html, 403.html, and 400.html in the templates root. Django serves these automatically when DEBUG=False. For custom logic, I can override error han

In production, you want errors that are both human-readable and machine-checkable. I wrap errors with %w so callers can still match them using errors.Is and errors.As. This avoids string comparisons like if err.Error() == ..., which break on refactors

APIs are easier to operate when errors are structured and consistent. Wrap errors into a problem-details style response with a stable type and request_id so support can quickly trace issues.

Cleanup paths are easy to under-test, and it’s common to ignore close errors because you only have one return value. With Go 1.20+, errors.Join gives you a clean way to accumulate multiple cleanup errors and return them as a single error value. This i