两个网站nginx +重定向

Question

我有以下nginx配置：

server
{
  listen 80;
  server_name server1.com;
  rewrite ^/(.*) http://www.server1.com permanent;
}

server
{
  listen 80;
  server_name server2.com;
  rewrite ^/(.*) http://www.server2.com permanent;
}

server
{
  listen 80;
  root /home/server1/;
  index index.php index.html index.htm;
  server_name www.server1.com;

  ...
}

server
{
  listen 80;
  root /home/server2/;
  index index.php index.html index.htm;
  server_name www.server2.com;

  ...
}

我的问题是，当我在浏览器中输入server2.com时，我被重定向到www.server1.com！其他一切都正常。知道为什么吗？

先谢谢！