string(266) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AE%9E%E4%BD%93%E5%BA%97%E5%95%86%E5%AE%B6%E4%B8%8D%E9%80%80%E6%AC%BE%E5%8F%AF%E4%BB%A5%E6%8A%A5%E8%AD%A6%E5%90%97 => Received HTTP code 403 from proxy after CONNECT"
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