Is it correct in my case to use JS from CDN Cloudflare?

Question

JavaScript

Hello. Recently I decided to optimize my blog and install the HTTPS protocol. Found a free option with Cloudflare. It seems that everything suits and there are many useful features. I set caching for JS, CSS, IMG files, etc. and when it came to JS, I remembered that Cloudflare has its own CDN.
This raises the question, why don't I use, for example, the jQuery library from Cloudflare CDN, given that I have DNS from Cloudflare and caching from this service is worth it. After all, there is a possibility that the user visited some site and the browser once already cached the link

//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.2/jquery.min.js

. Yes, there are doubts about the specific version, but nevertheless, would it be correct?

Answer 1

Yes, but what could be wrong here? The idea of ​​using a CDN is not quite new and has been worked out for years. The likelihood that a browser has visited a CDN is much higher than that a browser has visited your site. Therefore, CDNs are by definition more advantageous in 99% of cases where they can be applied. I can also recommend Google as a CDN service .
PS It is not possible to use CDN everywhere and not always, for example, on one project, scripts and CSS were generated/compiled/compressed dynamically (along with libraries and into one script), for example. there were a lot of them and it was not possible to upload everything at once to the browser. For everything else, CDN is a pretty good choice.