string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BE%AF%E5%8D%AB%E4%B8%9C%E5%AE%98%E5%9C%BA%E7%AC%94%E8%AE%B0%E5%9C%A8%E7%BA%BF%E5%85%A8%E6%96%87%E5%85%8D%E8%B4%B9%E9%98%85%E8%AF%BB => Received HTTP code 403 from proxy after CONNECT"
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