# File lib/wget.rb, line 15
  def open(url, *rest)
      raise TypeError.new("wrong argument type #{url.inspect}" +
                          " (expected String)") if url.class != String

    if url =~ /^\/|^\./ || (url !~ /^http:|^ftp:/ && FileTest.exist?(url))
      File::open(url, *rest)
    else
      ENV['http_proxy'] = PARAM['http_proxy'] if PARAM['http_proxy']
      ENV['ftp_proxy'] = PARAM['ftp_proxy'] if PARAM['ftp_proxy']
      IO::popen(PARAM['wget'] + ' ' + PARAM['opts'] + ' ' + url)
    end
  end