server {
    listen 443 ssl;
    client_max_body_size 4G;
    server_name REPLACE_fqdn_ECALPER;
    ssl_certificate /etc/letsencrypt/live/REPLACE_fqdn_ECALPER/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/REPLACE_fqdn_ECALPER/privkey.pem;

    // via <https://www.digitalocean.com/community/tutorials/how-to-improve-website-performance-using-gzip-and-nginx-on-ubuntu-20-04>
    // and https://docs.microblog.pub/installing.html#nginx-config-tips
    gzip on;
    gzip_disable "msie6";
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_buffers 16 8k;
    gzip_http_version 1.1;
    gzip_min_length 256;
    gzip_types
      application/atom+xml
      application/geo+json
      application/javascript
      application/x-javascript
      application/json
      application/ld+json
      application/manifest+json
      application/rdf+xml
      application/rss+xml
      application/xhtml+xml
      application/xml
      font/eot
      font/otf
      font/ttf
      image/svg+xml
      text/css
      text/javascript
      text/plain
      text/xml

      text/html

      application/javascript
      application/activity+json
      application/octet-stream;

    location / {
      proxy_set_header Host $http_host;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
      proxy_redirect off;
      proxy_buffering off;
      proxy_pass http://localhost:8000;
    }
}

map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}