使用nc发送http请求
echo -n "GET / HTTP/1.0\n\n\n"|nc phpgao.com 80 -vv
nc phpgao.com 80 <<END
HEAD / HTTP/1.1
Host: phpgao.com
END
echo -n "GET / HTTP/1.0\n\n\n"|nc phpgao.com 80 -vv
nc phpgao.com 80 <<END
HEAD / HTTP/1.1
Host: phpgao.com
END