string(285) "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%9A%84%E5%A5%BD%E6%96%B9%E6%B3%95%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D => Failed to connect to 101.89.159.206 port 38087: Connection refused"
收集数据的好方法是什么意思
