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

server {
  listen 80;
  server_name _;
  root /usr/share/nginx/html;
  index index.html;

  gzip on;
  gzip_types text/plain text/css application/javascript application/json image/svg+xml;
  gzip_min_length 1024;

  location = /healthz {
    access_log off;
    default_type text/plain;
    return 200 'ok\n';
  }

  location /ws {
    proxy_pass http://realtime:8787;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    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-Proto $scheme;
    proxy_set_header X-Forwarded-Host $host;
    proxy_set_header X-Forwarded-Port $server_port;
    proxy_read_timeout 1d;
    proxy_send_timeout 1d;
  }

  location ^~ /wordcloud-api/ {
    proxy_pass ${WORDCLOUD_API_UPSTREAM}/;
    proxy_http_version 1.1;
    proxy_set_header Host $proxy_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-Proto $scheme;
    proxy_set_header X-Forwarded-Host $host;
    proxy_set_header X-Forwarded-Port $server_port;
  }

  location ^~ /assets/ {
    try_files $uri =404;
    add_header Cache-Control "public, max-age=31536000, immutable";
  }

  location / {
    try_files $uri $uri/ /index.html;
    add_header Cache-Control "no-store, must-revalidate";
  }
}