HTTP functions were previously conditional on the resource URL being an
HTTP/HTTPS URL. In hindsight, this offers no benefits and can result in
confusing errors when the end user enters an invalid URL for an HTTP-based
integration. Instead of a URL-related or HTTP-related error, the user is
given a compilation error indicating that the HTTP-related function that
are being called (and they may not be aware of in any way) are not valid
references. So let's just always make them available.

(cherry picked from commit 14337dd)