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HTTP 304 Not Modified — Browser Cache Still Valid

Warning3xx redirection

Overview

HTTP 304 Not Modified tells the browser its cached version is still current. No data is transferred.

Key Details

  • Status: 304 Not Modified
  • Category: 3xx Redirection
  • Cached version is still valid
  • No response body — saves bandwidth

Common Causes

  • Browser sent If-None-Match with ETag
  • Browser sent If-Modified-Since header
  • Resource has not changed since last request
  • Cache validation succeeded

Steps

  1. 1Use the cached version — no action needed
  2. 2Check ETag headers for cache validation
  3. 3Verify Last-Modified headers are set correctly
  4. 4Configure proper cache headers on the server

Tags

http-status3xx-redirectionhttp-304httpstatus-code

More in 3xx Redirection

http-300-multiple-choicesHTTP 300 Multiple Choices — What It Means & How to Fix It
Warning
http-301-moved-permanentlyHTTP 301 Moved Permanently — What It Means & How to Fix It
Warning
http-302-foundHTTP 302 Found — What It Means & How to Fix It
Warning
http-303-see-otherHTTP 303 See Other — What It Means & How to Fix It
Warning
http-304-not-modifiedHTTP 304 Not Modified — What It Means & How to Fix It
Warning
http-305-use-proxyHTTP 305 Use Proxy — What It Means & How to Fix It
Warning

Frequently Asked Questions

Good — it means caching is working and saving bandwidth.