適用于 80端口和443 配置在同一個 server{}內

if ($server_port = 80) {
rewrite ^(.*)$ https://$host$1 permanent;
}

配置示例：

server {
listen       80;
server_name  www.22.cn;
rewrite ^ https://$http_host$request_uri? permanent;
}
server {
listen 443;
ssl on;
ssl_certificate /etc/ssl/cacert.pem;
ssl_certificate_key /etc/ssl/privkey.pem;
server_name www.22.cn;  
server_tokens off;
location / {
fastcgi_param   HTTPS               on;
fastcgi_param   HTTP_SCHEME         https;
}
}