    # File lib/rubygems/server.rb, line 405
      def quick(req, res)
        @source_index.refresh!

        res['content-type'] = 'text/plain'
        res['date'] = File.stat(@spec_dir).mtime

        case req.request_uri.path
        when '/quick/index' then
          res.body << @source_index.map { |name,| name }.sort.join("\n")
        when '/quick/index.rz' then
          index = @source_index.map { |name,| name }.sort.join("\n")
          res['content-type'] = 'application/x-deflate'
          res.body << Gem.deflate(index)
        when '/quick/latest_index' then
          index = @source_index.latest_specs.map { |spec| spec.full_name }
          res.body << index.sort.join("\n")
        when '/quick/latest_index.rz' then
          index = @source_index.latest_specs.map { |spec| spec.full_name }
          res['content-type'] = 'application/x-deflate'
          res.body << Gem.deflate(index.sort.join("\n"))
        when %r|^/quick/(Marshal.#{Regexp.escape Gem.marshal_version}/)?(.*?)-([0-9.]+)(-.*?)?\.gemspec\.rz$| then
          dep = Gem::Dependency.new $2, $3
          specs = @source_index.search dep
          marshal_format = $1

          selector = [$2, $3, $4].map { |s| s.inspect }.join ' '

          platform = if $4 then
                       Gem::Platform.new $4.sub(/^-/, '')
                     else
                       Gem::Platform::RUBY
                     end

          specs = specs.select { |s| s.platform == platform }

          if specs.empty? then
            res.status = 404
            res.body = "No gems found matching #{selector}"
          elsif specs.length > 1 then
            res.status = 500
            res.body = "Multiple gems found matching #{selector}"
          elsif marshal_format then
            res['content-type'] = 'application/x-deflate'
            res.body << Gem.deflate(Marshal.dump(specs.first))
          else # deprecated YAML format
            res['content-type'] = 'application/x-deflate'
            res.body << Gem.deflate(specs.first.to_yaml)
          end
        else
          raise WEBrick::HTTPStatus::NotFound, "`#{req.path}' not found."
        end
      end