最近遇到了典型的http 403, 来看看：
ubuntu@VM-0-13-ubuntu:~$ curl http://blog.csdn.net | head -n 10
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src='/js/tingyun-rum.js?1511847956' type='text/javascript'></script>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<title>CSDN首页-å…¨çƒæœ€å¤§ä¸æ–‡IT社区</title>
100 9675 0 9675 0 0 17920 0 --:--:-- --:--:-- --:--:-- 17949
curl: (23) Failed writing body (2613 != 2842)
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$ ping blog.csdn.net
PING blog.csdn.net (47.95.165.112) 56(84) bytes of data.
64 bytes from 47.95.165.112: icmp_seq=1 ttl=33 time=41.3 ms
64 bytes from 47.95.165.112: icmp_seq=2 ttl=33 time=41.3 ms
64 bytes from 47.95.165.112: icmp_seq=3 ttl=33 time=41.2 ms
^C
--- blog.csdn.net ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 41.272/41.300/41.327/0.022 ms
ubuntu@VM-0-13-ubuntu:~$ ^C
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$ curl http://47.95.165.112 | head -n 10
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 162 100 162 0 0 1950 0 --:--:-- --:--:-- --:--:-- 1975
<html>
<head><title>403 Forbidden</title></head>
<body bgcolor="white">
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx</center>
</body>
</html>
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$
ubuntu@VM-0-13-ubuntu:~$