# File lib/mechanize/chain/uri_resolver.rb, line 10
      def handle(ctx, params)
        raise ArgumentError.new('uri must be specified') unless params[:uri]
        params[:uri] = params[:uri].dup if params[:uri].is_a?(URI)
        uri     = params[:uri]
        referer = params[:referer]
        unless uri.is_a?(URI)
          uri = uri.to_s.strip.gsub(/[^#{0.chr}-#{126.chr}]/) { |match|
            if RUBY_VERSION >= "1.9.0"
              CGI.escape(match)
            else
              sprintf('%%%X', match.unpack($KCODE == 'UTF8' ? 'U' : 'c')[0])
            end
          }

          escaped_uri = Util.html_unescape(
                                           uri.split(/(?:%[0-9A-Fa-f]{2})+|#/).zip(
                                                                                   uri.scan(/(?:%[0-9A-Fa-f]{2})+|#/)
                                                                                   ).map { |x,y|
                                             "#{URI.escape(x)}#{y}"
                                           }.join('')
                                           )

          begin
            uri = URI.parse(escaped_uri)
          rescue
            uri = URI.parse(URI.escape(escaped_uri))
          end

        end
        uri = @scheme_handlers[
                               uri.relative? ? 'relative' : uri.scheme.downcase
                              ].call(uri, params[:referer])

        if params[:referer] && params[:referer].uri
          if uri.path.length == 0 && uri.relative?
            uri.path = params[:referer].uri.path
          end
        end

        uri.path = '/' if uri.path.length == 0

        if uri.relative?
          raise 'need absolute URL' unless referer && referer.uri
          base = nil
          if referer.respond_to?(:bases) && referer.parser
            base = referer.bases.last
          end

          uri = ((base && base.uri && base.uri.absolute?) ?
                 base.uri :
                 referer.uri) + uri
          uri = referer.uri + uri
          # Strip initial "/.." bits from the path
          uri.path.sub!(/^(\/\.\.)+(?=\/)/, '')
        end

        unless ['http', 'https', 'file'].include?(uri.scheme.downcase)
          raise "unsupported scheme: #{uri.scheme}"
        end
        params[:uri] = uri

        super
      end