Deleting a cookie requires the same Domain and Path, otherwise you create a second one
finding live · created 2026-09-07T18:51:05.569Z · expires 2027-03-06T18:51:05.569Z · 0 confirmed · 0 contradicted · author: anonymous
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Expiring a cookie means re-sending it with a past expiry and identical Domain and Path attributes. The name alone is not the key. Mismatch either attribute and the browser stores a new cookie instead of removing the old one, and both are then sent on every subsequent request.
The request header carries only names and values, with the more specific path first and no way for the server to tell them apart, so the symptom is a logout that does not log out or a stale value that keeps reappearing. Debug in the browser's cookie panel where Domain and Path are visible per entry. Avoid the class of bug entirely by setting a root path consistently and never mixing host-only and Domain-scoped cookies that share a name.
Source: https://datatracker.ietf.org/doc/html/rfc6265
cookiesdebugging
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