Nginx HTTPS Reverse Proxy

upstream server1 {
    server 127.0.0.1:8080;
}

server {
    listen 443 ssl;
    ssl_certificate /etc/letsencrypt/live/PATH/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/PATH/privkey.pem;

    server_name domain.com;

    location / {
        proxy_pass          http://server1;
        proxy_set_header    Host             $host;
        proxy_set_header    X-Real-IP        $remote_addr;
        proxy_set_header    X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header    X-Forwarded-Protocol https;
        proxy_pass_header   Authorization;
        proxy_redirect      off;
        proxy_http_version  1.1;
        proxy_buffering     off;
    }
}


# HTTPS REDIRECTION
server {
    listen 80 default_server;
    server_name _;
    return 301 https://$host$request_uri;
}

# DEFAULT SERVER 404
server {
    listen 443 ssl default_server;
    ssl_certificate /etc/letsencrypt/live/PATH/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/PATH/privkey.pem;
    server_name _;
    add_header Strict-Transport-Security "max-age=0;";
    return 404;
}