string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8E%BB%E9%A6%99%E6%B8%AF%E7%95%99%E5%AD%A6%E5%AD%A6%E8%B4%B9%E5%A4%9A%E5%B0%91 => Received HTTP code 403 from proxy after CONNECT"
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