A single HTTP result is only one observation; a dated history can reveal migrations, recurring failures and stale destinations.
Capture exact request context
Record method, hostname, path, response code, redirect location and time.
Different paths or request types can legitimately produce different results.
Distinguish temporary and permanent redirects
A 302 or 307 may represent a short transition, while a 301 or 308 communicates a durable preference.
Neither code proves the target belongs to the same operator.
Interpret errors carefully
Authentication, rate limits, server errors and missing pages describe different conditions.
Avoid reducing every non-200 result to offline.
Look for repeatable patterns
Compare observations across reasonable intervals and from the same documented method.
Consistent history is stronger than an isolated response captured during an incident.
Connect history to source updates
A response transition is easier to interpret when a dated publisher notice explains it.
Without that connection, preserve the technical fact and keep ownership conclusions pending.