Successful response
A 2xx response means the server completed the request; it does not by itself prove the page contains the intended content.
Website + network
Check the real HTTP status and redirect path.
Follow a bounded redirect chain and see each HTTP status, destination, connected IP and final TLS details.
Result
Diagnostic result
Redirects
Permanent and temporary redirects have different caching and search implications. Long chains add latency and complexity.
Client-facing errors
404, 410, 401 and 403 communicate different resource/access states and should not be treated as interchangeable.
Server-side failures
A 5xx response usually means the request reached a server that could not complete it. Capture the exact status before changing DNS or TLS.