string(296) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E6%98%AF%E7%9F%AD%E8%B7%AF%E5%92%8C%E6%96%AD%E8%B7%AF%2C%E4%B8%A4%E8%80%85%E5%A6%82%E4%BD%95%E5%8C%BA%E5%88%AB%E7%89%A9%E7%90%86 => Received HTTP code 403 from proxy after CONNECT"
什么是短路和断路,两者如何区别物理
