string(234) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E6%97%A0%E6%B3%95%E6%89%93%E5%BC%80%E7%9A%84%E5%8E%9F%E5%9B%A0 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
cad无法打开的原因
