Redirect loop
A redirect loop is an error where a URL redirects to another URL that eventually points back to the first, so the browser never reaches a real page.
If page A redirects to B and B redirects back to A, whether directly or through a chain, the browser bounces between them until it gives up with a "too many redirects" error. It usually comes from a misconfigured destination, like pointing a redirect at a URL that itself redirects back.
It's an easy mistake to make by hand and a good reason to keep redirect targets simple: point an editable code straight at the final page, not at another redirector. If a scan errors out instead of loading, a loop in the destination is worth ruling out.
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