// http 3xx · redirection
HTTP 304 Not Modified
The cached copy is still valid; no body is sent.
What HTTP 304 Not Modified means
304 Not Modified is a caching response: the client's cached copy is still valid, so the server sends no body. It follows a conditional request (`If-None-Match` or `If-Modified-Since`) and saves bandwidth by letting the browser reuse what it already has.
Which category is it?
304 is a 3xx code — Redirection. 3xx means further action is needed to complete the request, usually because the resource lives at a different URL.