Loading the Deezer Javascript SDK over http from http://cdn-files.deezer.com/js/min/dz.js works fine, but when trying to download it over https from https://cdn-files.deezer.com/js/min/dz.js, the request times out, both in the browser and with e.g. curl. Based on another answer, I understood that the SDK should be available over https too, so is there some problem with the SDK hosting?
In the docs, it is written that the url for https should be https://cdns-files.deezer.com/js/min/dz.js
Note the s at the end of cdns.
You can check this information here.
Hope it helps.