string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AE%89%E7%89%B9%E4%B8%BD%E6%8B%89%E6%9D%86%E7%AE%B1%E5%AE%98%E7%BD%91 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
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