3xx RedirectionHTTP Status Code Reference
HTTP 304 Not Modified— What It Means, Causes & How to Fix It
The resource has not been modified since the version specified by the request headers (If-Modified-Since or If-None-Match). The client can use its cached copy. No body is returned.
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Common Causes
- Browser cache is still valid for the requested resource
- ETag matches the current version on the server
- Resource unchanged since the If-Modified-Since date
How to Fix
- 1No fix needed — caching is working correctly
- 2Force refresh (Ctrl+Shift+R) to bypass the cache
- 3Clear browser cache if you need the latest version
- 4Check ETag and Last-Modified headers if stale content appears
Example
HTTP 304 Not Modified
GET /style.css HTTP/1.1 If-None-Match: "v2.1" → 304 Not Modified → Browser uses cached version
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