snownews doesn't seem to work when using https url, the program returns an error. Adding the http url for the same xml file was producing expected result.
I tried a few https url and none work, and no issues when using http. Found in ~/.snonews/error.log: Fri Nov 30 12:34:18 2018: (https://perso.pw/openbsd-current.xml) https://perso.pw/openbsd-current.xml: Error in server reply.