string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%A4%BE%E5%8C%BA%E7%94%B5%E5%95%86%E8%B4%AD%E7%89%A9%E5%B9%B3%E5%8F%B0 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
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