string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%97%A8%E5%AD%A6%E7%BD%91%E5%A6%82%E4%BD%95%E8%BF%BD%E5%9B%9E%E9%80%80%E6%AC%BE => Failed to connect to 14.18.117.71 port 38093: Connection refused"
嗨学网如何追回退款
