二级子域名如何使用nginx使得http跳转https?

Question

主域名 baidu.com
子域名 b.baidu.com
希望可以都可以Http跳转到Https
比如 http://baidu.com -> https://baidu.com
http://b.baidu.com -> https://b.baidu.com

请问如何配置？
现有的配置：

server {
        listen 80;
        server_name baidu.com;
        rewrite ^(.*)$ https://$server_name$1 permanent;

}
server {
        listen 80;
        server_name b.baidu.com;
        rewrite ^(.*)$ https://$server_name$1 permanent;

}

这样配置子域名无法跳转

Answer 1

server {
    listen 80;
    server_name baidu.com;
    if ($scheme != "https") {
        return 301 https://$host$request_uri;
    }
}
server {
    listen 80;
    server_name b.baidu.com;
    if ($scheme != "https") {
        return 301 https://$host$request_uri;
    }
}