string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%80%E6%96%B0%E7%BE%8E%E5%9B%BD%E9%AB%98%E4%B8%AD%E7%95%99%E5%AD%A6%E7%9C%9F%E5%AE%9E%E8%B4%B9%E7%94%A8 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
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