string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%80%E7%B2%89%E5%92%8C%E7%94%9F%E7%B2%89%E6%98%AF%E4%B8%80%E6%A0%B7%E7%9A%84%E5%98%9B%E4%B8%BA%E4%BB%80%E4%B9%88 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
淀粉和生粉是一样的嘛为什么
