nginx.conf

server {
	listen 80 default_server;
	listen [::]:80 default_server;
	server_name _;
	return 301 https://$host$request_uri;
}

server {
  listen 443 default ssl;
  server_name cs-insights.uni-goettingen.de;
  ssl_certificate     /etc/letsencrypt/live/cs-insights/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/cs-insights/privkey.pem;
  error_log /var/log/nginx/debug.log debug;
  gzip on;
  gzip_proxied any;
  gzip_types
      binary/octet-stream
      text/css
      text/javascript
      text/xml
      text/plain
      application/javascript
      application/x-javascript
      application/json;

  location / {
      root   /usr/share/nginx/html;
      try_files $uri $uri/ /index.html;
      index  index.html index.htm;
  }

  location /api/ {
      proxy_pass http://backend:3000/api/;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection 'upgrade';
      proxy_set_header Host $host;
      proxy_cache_bypass $http_upgrade;
      client_max_body_size 16400M;
  }
}