# File lib/rack/handler/webrick.rb, line 8
      def self.run(app, options={})
        options[:BindAddress] = options.delete(:Host) if options[:Host]
        @server = ::WEBrick::HTTPServer.new(options)
        @server.mount "/", Rack::Handler::WEBrick, app
        yield @server  if block_given?
        @server.start
      end