Validates that an external/public media URL uses an explicit http: or https: scheme with a non-empty host (never javascript:, data:, blob:, file:, or scheme-relative //...).
http:
https:
javascript:
data:
blob:
file:
//...
Validates that an external/public media URL uses an explicit
http:orhttps:scheme with a non-empty host (neverjavascript:,data:,blob:,file:, or scheme-relative//...).