URL, hostname, domain and path

A URL, hostname, domain and path describe an application-layer request; distinguish network reachability from the web-server response. DNS can resolve, TCP/TLS can connect, and HTTP can still return a redirect or error. Status code, Location, hostname, path and URL scheme describe different parts of the transaction.

How to investigate the web response

Check DNS, then TLS and the HTTP response without hiding the redirect chain. Compare the requested hostname with the actual target URL. A 4xx response generally describes the request or access, while 5xx indicates unsuccessful server-side handling, although a reverse proxy or CDN may be another participant in the path.

The detail that matters

In https://example.com:8443/a/b?q=1#part, https is the scheme, example.com the hostname, 8443 the explicit port, /a/b the path, q=1 the query, and part the fragment. The fragment is normally handled by the client and is not sent in the HTTP request. For an external check of the site, use 2ip site information check.