string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%98%E5%AE%9D%E7%BD%91%E6%8F%90%E4%BE%9B%E4%BB%80%E4%B9%88%E6%9C%8D%E5%8A%A1 => Received HTTP code 403 from proxy after CONNECT"
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