string(338) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E9%87%8C%E7%9A%84%E9%9B%B6%E9%92%B1%E9%80%9A%E5%AE%89%E5%85%A8%E5%90%97%E6%9C%89%E9%A3%8E%E9%99%A9%E5%90%97%E6%9C%89%E7%94%A8%E8%BF%87%E7%9A%84%E6%9C%8B%E5%8F%8B%E5%90%97 => Received HTTP code 403 from proxy after CONNECT"
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