string(329) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8B%8D%E6%8B%8D%E8%B4%B7%E5%80%9F%E6%AC%BE%E6%98%AF%E6%AD%A3%E8%A7%84%E5%90%88%E6%B3%95%E5%B9%B3%E5%8F%B0%E5%90%97%E4%B8%8D%E8%BF%98%E5%8F%AF%E4%BB%A5%E5%90%97%E7%9F%A5%E4%B9%8E => Received HTTP code 403 from proxy after CONNECT"
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