$ curl 'http://firefox.net.cn/' -v
* Trying 106.186.27.151...
* TCP_NODELAY set
* Connected to firefox.net.cn (106.186.27.151) port 80 (#0)
> GET / HTTP/1.1
> Host: firefox.net.cn
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< Server: nginx
< Date: Thu, 14 Sep 2017 00:37:10 GMT
< Content-Type: text/html
< Content-Length: 178
< Connection: keep-alive
< Keep-Alive: timeout=20
< Location: https://www.firefox.net.cn/
<<html><head><title>301 Moved Permanently</title></head><body bgcolor="white"><center><h1>301 Moved Permanently</h1></center><hr /><center>nginx</center></body></html>* Connection #0 to host firefox.net.cn left intact