Redirect Loop Debug Checklist: A Fast Way to Find What Keeps Sending Users Back

Start with the full chain

Do not debug a loop from the final error screen alone. Capture the full sequence of hops so you can see which rule sends traffic back to a URL that already appeared.

Check every layer involved

Look at CDN rules, load balancer behavior, reverse proxy headers, app-level redirects, localization logic, authentication middleware, and trailing slash normalization.

Narrow it down systematically

Turn layers off one by one in a safe environment, or test them independently. Redirect loops are usually not mysterious; they are just the product of two rules both thinking they are in charge.