string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%95%86%E5%AE%B6%E6%80%95%E5%95%A5%E6%8A%95%E8%AF%89%E5%B9%B3%E5%8F%B0 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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