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The redirect wrote the new scheme and host through r.URL, so the caller saw its own request rewritten. Copy the URL first.
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Summary
An HTTPS redirect assigned
r.URLand then changed the scheme and host. The caller still holds that request, so a later check can treat the original HTTP request as HTTPS, or keep the rewritten host. The Location header is now built from a copy, and the caller's URL stays as it arrived.Test plan
go test -count=1 .passesTestSSLRedirectLeavesRequestURLandTestSSLForceHostLeavesRequestURLfail onurl := r.URLand pass with the copy