Do you recommend relative URLs vs absolute ones?
ANSWER: In the past few years, the trend among some bloggers has been to recommend absolute URLs instead of relative URLs, even though just a while back it was the opposite trend. Here at LittleBizzy we recommend relative URLs, because it can help with link tracking such as Facebook likes, and other tracking campaigns:
https://stackoverflow.com/questions/34866562/can-i-use-a-protocol-free-url-with-rel-canonical
https://moz.com/community/q/can-i-leave-off-http-https-in-a-canonical-tag
However if you wish to disable this feature simply visit Settings >> CloudFlare to turn it off. Keep in mind that doing so could break your SSL (green padlock) because some insecure resources could once again become insecure (loaded over HTTP rather than HTTPS).