Front desk · HTTP Status Codes
3×× Redirection
304 Not Modified
· filed 2026-07-18 · click a code to copy
HTTP 304 Not Modified is a redirection-class status code defined in RFC9110. The cached version is still valid; the resource has not been modified since the last request.
Redirection responses tell the client to look elsewhere — permanently, temporarily, or in its own cache. On the wire, the response begins with the status line HTTP/1.1 304 Not Modified.