string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BC%80%E4%B8%AA%E6%97%A0%E4%BA%BA%E5%94%AE%E8%B4%A7%E5%BA%97%E9%9C%80%E8%A6%81%E6%8A%95%E8%B5%84%E5%A4%9A%E5%B0%91 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
开个无人售货店需要投资多少
