string(228) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%B8%80%E5%BB%BA%E5%B8%82%E6%94%BF%E6%95%99%E6%9D%90pdf%E5%85%8D%E8%B4%B9 => Received HTTP code 403 from proxy after CONNECT"
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