string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%90%91%E7%A8%8B%E5%BA%8F%E5%8F%91%E9%80%81%E5%91%BD%E4%BB%A4%E6%97%B6%E9%94%99%E8%AF%AF%E5%8E%9F%E5%9B%A0 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
向程序发送命令时错误原因
