string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%8E%AF%E4%BF%9D%E5%B1%80%E7%94%B5%E8%AF%9D%E4%B8%BE%E6%8A%A5%E4%B8%AD%E5%BF%83 => Received HTTP code 403 from proxy after CONNECT"
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