HTTP 304 Not Modified — What It Means & How to Fix It

What Does This Error Mean?

A 304 Not Modified response means the page you requested has not changed since the last time you visited. Instead of sending you the full page again, the server says: 'You already have an up-to-date copy in your browser cache — use that.' This saves bandwidth and makes websites load faster. A 304 is not an error at all — it is the web working efficiently. You will usually only see it in technical browser tools, not as an error message on a webpage.

Affected Models

All web browsers
All websites
Browser developer tools
Content delivery networks

Common Causes

Your browser has a cached copy of the page that is still current
The website's content has not changed since your last visit
The browser sent a conditional request checking if an update was needed, and none was
A content delivery network confirmed the cached version is still valid
The server is optimizing bandwidth by avoiding resending unchanged content

How to Fix It

If you think the page should have updated content, press Ctrl+F5 (Windows) or Cmd+Shift+R (Mac) to force a full reload.

This bypasses the cached version and requests a fresh copy from the server.
Clear your browser cache. Go to Settings > Privacy > Clear browsing data and select 'Cached images and files'.

After clearing, your next visit will always load a fresh copy of the page.
If you are a developer and see 304s in your developer tools, this is normal and healthy — no action needed.

304 responses indicate your caching is working correctly.
If a page looks outdated and Ctrl+F5 does not fix it, try opening it in incognito mode.

Incognito windows have no cache, so you will always see the current version of any page.
On mobile browsers, you may need to clear the app's cache. Go to your phone's app settings and clear the browser's cached data.

Mobile browsers cache aggressively for data efficiency — clearing cache is more often needed.

When to Call a Professional

A 304 is not a problem and needs no action from visitors. If you believe a page should have updated content but still see old content, the steps below will force a fresh load. Website owners should ensure their cache expiry settings are appropriate so users always receive fresh content when needed.

Frequently Asked Questions

Is a 304 response an error?

No — a 304 is a success response. It means everything worked correctly and your browser is efficiently reusing cached content. You will only see it in browser developer tools, not as an error message on a webpage.

Why would I see stale content after a website updates?

If a website updates but your browser still serves cached content, the cache expiry time may be set too long. A hard refresh (Ctrl+F5) forces a fresh copy. Website owners control how long content is cached — a good site updates cache when content changes.

Does a 304 save me money on mobile data?

Yes — receiving a 304 instead of the full page means less data is transferred. For pages you visit regularly, caching can save a significant amount of mobile data over time.