string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8B%BC%E5%A4%9A%E5%A4%9A%E6%9C%80%E6%96%B0%E6%95%B0%E6%8D%AE%E5%88%86%E6%9E%90 => Received HTTP code 403 from proxy after CONNECT"
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