string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BC%A0%E9%9B%AA%E5%B3%B0%E5%AF%B9%E5%87%BA%E5%9B%BD%E7%95%99%E5%AD%A6%E7%9A%84%E7%9C%8B%E6%B3%95 => Received HTTP code 403 from proxy after CONNECT"
张雪峰对出国留学的看法
