达到的效果：源站是https，然后访问反代服务器也是https。

使用军哥的 LNMP，反代配置如下：

location / {
        sub_filter 123.com 123.net;
        proxy_pass        https://123.com;
        proxy_set_header   X-Real-IP 源站IP地址;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   Referer https://123.com;
        proxy_set_header REMOTE-HOST $remote_addr;
        add_header X-Cache $upstream_cache_status;
        proxy_set_header Accept-Encoding "";
        sub_filter "123.com" "123.net";
        sub_filter_once off;
        expires 12h;
    }