string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BA%A2%E6%9D%89%E8%B5%84%E6%9C%AC%E7%9A%84%E8%83%8C%E6%99%AF%E7%9F%A5%E4%B9%8E => Failed to connect to 101.89.143.195 port 38109: Connection refused"
红杉资本的背景知乎
