Mathjax plugin broken when ckeditor is used over https:// protocol

[Boson Au]

Steps:

1. instantiate ckeditor with mathjax plugin installed using https protocol.
2. clicking mathjax throws error in console:

Chrome:"[blocked] The page at '[site with https]' was loaded over     HTTPS, but ran insecure content from 'http://cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-AMS_HTML': this content should also be loaded over HTTPS."

in Firefox: "[14:41:12.367] Blocked loading mixed active content "http://cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-AMS_HTML" @ https://[site]"

os:pc/mac

browser:chrome

according to the Mathjax website: ​http://www.mathjax.org/resources/faqs/#problem-https

their CDN does not offer https support and instead, asks users to use ​https://c328740.ssl.cf1.rackcdn.com/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML as an alternative address. It'd be great if ckeditor can test the protocol of the browser accessing the script and change the path accordingly. even better would be leaving plugin.js in the mathjax plugin folder as it was in version 4.3 beta.

[Jakub Ś]

This isn't only Chrome. Firefox blocks mathjax as well while IE asks if it should display content or not (IE default setting).

Problem can be reproduced from CKEditor 4.3 beta.

I think it would be best if we could detect protocol (​http://stackoverflow.com/questions/4723213/detect-http-or-https-then-force-https-in-javascript) and call correct URL.

[Jonathan Paul Costello]

It looks like mathjax's cdn works with https now. ​https://cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-AMS_HTML works for me.

[Jakub Ś]

Thanks for letting us know.