On some hosts https downloads in the plugin manager aren't possible.
Either github supports a (not official supported) http download option, therefor you need to refer to nodeload.github.com.
---copied from https://www.dokuwiki.org/plugin:plugin
prefix the **github.com** with **nodeload.** (so you get **nodeload.github.com** ) and it will download correctly. \\
perhaps the links in the plugin it could be rewritten automatically..\\
--- [[Hans Harder]] //2012/10/18 17:22//
Confirmed, i had the same problem and i resolved it with the next url:
--- [[Xabi Ezpeleta]] //2012/11/21 11:12//
Also developers of other projects have these issues:
Their url building:
And here their change to fix it again: https://github.com/composer/composer/commit/1682532b80b9a9fee1b70458f5dbac845561881e
Indeed not official supported. Github employee reply: