How to solve nginx304 error

Answer to the question: 304 Not Modified error indicates that the browser has cached the latest resource version of the client request. Solution: 1. Clear the browser cache; 2. Disable the browser cache; 3. Configure Nginx to allow client cache; 4. Check file permissions; 5. Check file hash; 6. Disable CDN or reverse proxy cache; 7. Restart Nginx.

How to resolve Nginx 304 errors

Question: Why does an Nginx 304 error appear?

Answer: 304 Not Modified error indicates that the latest version of the resource requested by the client already exists in the browser cache, so there is no need to download the resource again.

Solution:

1. Clear the browser cache

• On Chrome: Ctrl Shift Del
• On Firefox: Ctrl Shift Delete
• On Safari: Cmd Option E
• On Edge: Ctrl Shift Del

2. Disable browser cache

For development and debugging purposes, browser caching can be temporarily disabled:

• On Chrome: Press F12 to open the Developer Tools, then go to the Network tab and select Disable Cache.
• On Firefox: Type "about:config" in the address bar, search for "network.http.use-cache", and set it to "false".

3. Configure Nginx to allow client cache

Ensure that client cache is allowed in Nginx configuration:

 <code>location / { expires 1d; add_header Cache-Control "public"; }</code>

4. Check file permissions

Make sure that the web server has the permissions required to read the file:

• Linux: Use the chown or chmod command to modify permissions for files or directories.
• Windows: Right-click the file or folder, select Properties, and modify permissions in the Security tab.

5. Check file hash

304 The error may also be caused by a mismatch in file hash. Use the md5sum or sha256sum command to check if the file hash matches the hash on the server.

6. Disable CDN or reverse proxy cache

If using a CDN or reverse proxy, check if its configuration disables cache.

7. Restart Nginx

After making the changes, restart Nginx for the changes to take effect.

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