Nginx 不带www域名跳转到www域名

server
{
   listen 80;
   server_name www.returnc.com;
   ……
}

server {
  server_name  returnc.com;
  rewrite ^(.*)$ http://www.returnc.com$1 permanent;
}

返之 让www.returnc.com 跳转到 returnc.com

server
{
   listen 80;
   server_name returnc.com;
   ……
}

server {
  server_name  www.returnc.com;
  rewrite ^(.*)$ http://returnc.com$1 permanent;
}