string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%BF%9E%E9%94%81%E5%BA%97%E7%AE%A1%E7%90%86%E7%B3%BB%E7%BB%9F%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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