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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 safe, like a GET
or a HEAD
request, or when the request is conditional and uses a If-None-Match
or a If-Modified-Since
header.
If the equivalent 200
OK
response would have included the headers Cache-Control
, Content-Location
, Date
, ETag
, Expires
, and Vary
.
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
304 Not Modified
Specifications
Specification | Title |
---|---|
RFC 7232, section 4.1: 304 Not Modified | Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Servo |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Edge Mobile | Firefox for Android | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |