string(347) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%86%B0%E7%AE%B1%E7%BB%93%E5%86%B0%E6%80%8E%E4%B9%88%E5%8A%9E%2C%E6%95%99%E4%BD%A0%E4%B8%AA%E5%B0%8F%E6%8A%80%E5%B7%A7%E5%BF%AB%E9%80%9F%E5%8E%BB%E9%99%A4%2C%E7%9C%81%E6%97%B6%E7%9C%81%E5%8A%9B%21 => Received HTTP code 403 from proxy after CONNECT"
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