# File lib/scrubyt/core/navigation/agents/mechanize.rb, line 125
          def self.determine_protocol
            old_protocol = @@current_doc_protocol
            new_protocol = case @@current_doc_url
              when /^https/
                'https'
              when /^http/
                'http'
              when /^www/
                'http'
              else
                'file'
              end
            return 'http' if ((old_protocol == 'http') && new_protocol == 'file')
            return 'https' if ((old_protocol == 'https') && new_protocol == 'file')
            new_protocol
          end