string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8D%81%E5%85%AD%E8%BF%9B%E5%88%B6%E4%B8%8E%E8%BF%90%E7%AE%97%E8%AE%A1%E7%AE%97%E5%99%A8 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
十六进制与运算计算器
