When a handler sets a cookie and then panics before sending
anything, the recover middleware now deletes Set-Cookie before
writing its 500, so a request that failed never hands the client
a credential. Every other header, Location included, is left as
http.Error leaves it, matching chi's Recoverer. A response that
was already sent is untouched.
Tests cover the uncommitted case (no cookie, Location kept) and
assert the cookie still reaches the client when the response was
committed before the panic.
Model: opus-5-5
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