string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%87%91%E8%B5%9B%E7%94%9F%E9%95%BF%E6%BF%80%E7%B4%A0%E5%AE%98%E7%BD%91 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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