string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%96%E9%9F%B3%E9%87%8C%E6%B8%85%E7%90%86%E7%BC%93%E5%AD%98%E6%98%AF%E5%B9%B2%E5%95%A5%E7%9A%84 => Received HTTP code 403 from proxy after CONNECT"
抖音里清理缓存是干啥的
