304
Not Modified
Redirection (3xx)·RFC 9110
What 304 means
The cached version is still valid; the client can reuse it without re-downloading.
Returned for conditional requests (If-None-Match / If-Modified-Since). Saves bandwidth by skipping the body.
Redirection (3xx)
Further action (usually a redirect) is needed to complete the request.
Other 3xx codes
FAQ — 304
What does HTTP 304 mean?
304 Not Modified: The cached version is still valid; the client can reuse it without re-downloading. Returned for conditional requests (If-None-Match / If-Modified-Since). Saves bandwidth by skipping the body.
Which class does status code 304 belong to?
304 is a Redirection (3xx) code. Further action (usually a redirect) is needed to complete the request.
Where is the 304 code defined?
Status code 304 is defined in RFC 9110 and is part of the IANA HTTP Status Code Registry.