Nginx代理基于SNI而无需解密

我目前正在使用以下(简化)配置来代理同一端口上的http和https连接(aws elastic beanstalk所需)：

server {
    listen 777 ssl;
    server_name foo.com;
    ssl_certificate /etc/nginx/ssl/foo.crt;
    ssl_certificate_key /etc/nginx/ssl/foo;

    root /usr/share/nginx/www;
    index index.html index.htm;

    error_page 418 = @upstream;
    error_page 497 = @upstream;

    location / {
        return 418;
    }

    location @upstream {
        proxy_set_header  X-Forwarded-Proto  $scheme;
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:8080;
    }
}

我想将上游更改为uwsgi并让uwsgi处理ssl,因为它可以简化部署.

如何在没有Nginx解密ssl流量的情况下调整我的配置以适用于SNI HTTPS和HTTP？