string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%94%B6%E9%9B%86%E6%95%B0%E6%8D%AE%E7%94%A8%E4%BB%80%E4%B9%88%E6%96%B9%E6%B3%95%E6%AF%94%E8%BE%83%E5%A5%BD => Failed to connect to 101.89.117.144 port 38056: Connection refused"
收集数据用什么方法比较好
