If you cached main.js and then uploaded a corrected version with the same name, what will happen and how to fix it?

If the browser has cached main.js, and then a new version appears on the server with the same name, the browser will continue to use the old version from the cache, and changes will not be visible to users.

To solve this problem, the following are used:

• File versioning — adding a hash or version number to the filename, for example main.abc123.js. When updating, the filename changes, and the browser loads the new version.
• HTTP cache header configuration — for example, Cache-Control with a short lifetime or no-cache, so the browser checks for updates.

Example of versioning in HTML:

<script src="main.abc123.js"></script>

Where abc123 is the hash of the file content, which changes upon update.