Observation

I'm getting mixed content errors in the Firefox console while trying to updgrade extensions it seems to try to access http://mywikiurl.com/... instead of https://mywikiurl.com

Blocked loading mixed active content "http://mywikiurl.com/bin/get/XWiki/ExtensionUpdater?extensionSection=progress&extensionId=org.xwiki.contrib%3Axwiki-macro-map&extensionVersion=2.1&extensionNamespace=wiki%3Axwiki&xback=%2Fbin%2Fget%2FXWiki%2FExtensionUpdater%3Fsection%3DXWiki.ExtensionUpdater&section=XWiki.ExtensionUpdater"

The update is still happening, it is just the update on the screen that does not happen, refreshing the page regularly allows to see the updates.

I get a similar error when I try to upload a file, file get uploaded but I get that warning and have to refresh the page to see that it uploaded correctly.

Settings

I did set the protocol to https in xwiki.cfg, but it didn't change anything (I guess it detected it properly for all the rest anyway).

Expected behavior

The query (XHR?) should be using https when asked or at least follow the protocol forced into xwiki.cfg.