Always use https URLs.
Always use https URLs.

Using protocol-agnostic URLs has been an antipattern for 3 years [1],
and it also breaks loading directly from the file system.

[1] https://www.paulirish.com/2010/the-protocol-relative-url/

airspeed-velocity/asv,airspeed-velocity/asv,pv/asv,spacetelescope/asv,airspeed-velocity/asv,qwhelan/asv,qwhelan/asv,spacetelescope/asv,qwhelan/asv,qwhelan/asv,spacetelescope/asv,pv/asv,pv/asv,spacetelescope/asv,airspeed-velocity/asv,pv/asv