lib/sfkb/rest.rb
def url?(string)
      return false unless string.to_s =~ url_pattern
      return false if     string.to_s =~ @@placeholder
      true
    end
def url?(string)
      return false unless string.to_s =~ url_pattern
      return false if     string.to_s =~ @@placeholder
      true
    end
Identifies a valid URL for this REST instance