304 304 Not Modified

The resource has not changed since the last request. The browser can use its cached version.

When you'll see it

When a browser or crawler asks whether its cached copy is still fresh, with If-None-Match or If-Modified-Since, and the answer is yes. The server sends no body, and the cached copy is used.

What to check

That the ETag or Last-Modified value changes when the content does, or visitors keep seeing the old version.
That the response has no body.
To force a fresh copy while debugging, reload with the cache disabled in the browser's developer tools.

Example response

HTTP/1.1 304 Not Modified
ETag: "33a64df5"
Cache-Control: max-age=300

SEO impact

Positive for crawl efficiency. It tells Googlebot the page has not changed, saving crawl budget.

At a glance

Status code	304
Group	3xx Redirection
Class	3xx