string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%8E%B0%E5%9C%A8%E4%BB%80%E4%B9%88%E5%B9%B3%E5%8F%B0%E6%8E%A8%E5%B9%BF%E6%95%88%E6%9E%9C%E6%AF%94%E8%BE%83%E5%A5%BD => Failed to connect to 101.89.117.144 port 38017: Connection refused"
现在什么平台推广效果比较好
