Multiple external JavaScript files using one script tag

Question

I have seen on some websites they have one script tag but call multiple JS file e.g. <script src="script1.js,script2.js,script3.js"></script>

How do I do this? (Looking for both PHP and ASP.NET)

I have done a search on Google but struggled to find anything relevant.

Thanks

Answer 1

You need to write a server-side script that parses the script names from the URL or query string, and sends a single response with the contents of all of the scripts.

Make sure to validate the script names to prevent attackers from reading arbitrary files.