304 Not Modified
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.
Note: Many developer tools' network panels
of browsers create extraneous requests leading to 304 responses, so that
access to the local cache is visible to developers.
Status
http
304 Not Modified
Specifications
| Specification |
|---|
| HTTP Semantics # status.304 |
Browser compatibility
BCD tables only load in the browser
Compatibility notes
- Browser behavior differs if this response erroneously includes a body on persistent connections. See 204 No Content for more detail.