# File lib/rack/builder.rb, line 32
    def self.parse_file(config, opts = Server::Options.new)
      options = {}
      if config =~ /\.ru$/
        cfgfile = ::File.read(config)
        if cfgfile[/^#\\(.*)/] && opts
          options = opts.parse! $1.split(/\s+/)
        end
        cfgfile.sub!(/^__END__\n.*\Z/m, '')
        app = new_from_string cfgfile, config
      else
        require config
        app = Object.const_get(::File.basename(config, '.rb').capitalize)
      end
      return app, options
    end