Trailing slash mismatch causes unexpected redirects or 404s

Flask treats /users and /users/ as distinct routes. Requests to /users/ redirect to /users (308) if route defined without trailing slash, or vice versa (301). This causes client confusion or 404s if redirects disabled.

For API routes, define without trailing slashes and set strict_slashes=False per route, or globally via app.url_map.strict_slashes = False. This makes both /api/users and /api/users/ accept requests.