Subscriptions list api issue

[allentown]

GET https://theoldreader.com/reader/api/0/subscription/list?output=json

i found that iconUrl return like "//s.theoldreader.com/system/uploads/feed/picture/514c/80cf/54cf/82dd/1f01/icon_0b0d.ico", it should add http or https , i am not sure if there is issue for others api too