Open edX Mathjax Bugfix: "WARNING: cdn.mathjax.org has been retired"

Many Open edX platforms broke a few days ago when the CDN that hosts Mathjax changed from cdn.mathjax.org to cdnjs.cloudflare.com.

Ned Batchelder, an engineering lead at edX, explained on Google Groups that platforms on Ficus 2 should be updated to Ficus 3 immediately.

However, this issue affects all platforms that are older than Ficus 2 (including Eucalyptus). As such, you may have seen the following error:

In order to manually apply the Mathjax patch to these instances, follow the steps detailed in this commit from edX on April 12 and add the following to lms/envs/common.py.

Then, remember to restart edxapp and update the assets to kick the changes into effect:

Mathjax’s CDN should now be upgraded and the platform be good to go!

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