304 Not Modified
Description
The HTTP 304 Not Modified client redirection response
code indicates that there is no need to retransmit the requested resources. It is an
implicit redirection to a cached resource. This happens when the request method is
a safe method, such as GET or HEAD,
or when the request is conditional and uses an If-None-Match or an
If-Modified-Since header.
The response must not contain a body and must include the headers that would
have been sent in an equivalent 200 OK response:
Cache-Control, Content-Location, Date, ETag, Expires, and Vary.
See Also
- Spec
- If-Modified-Since, the header that triggers the
304 Not Modifiedresponse - If-None-Match, the header that triggers the
304 Not Modifiedresponse - 204 No Content
Source: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/304
