nginx.conf

user nginx;
worker_processes 1;

error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
  worker_connections 1024;
}

http {
  include /etc/nginx/mime.types;
  default_type application/octet-stream;

  keepalive_timeout 65;
  types_hash_max_size 2048;
  server_names_hash_bucket_size 64;

  log_format main '$remote_addr - $remote_user [$time_local] "$request" '
  '$status $body_bytes_sent "$http_referer" '
  '"$http_user_agent" "$http_x_forwarded_for"';

  access_log /var/log/nginx/access.log main;

  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;

  server {
    listen 80 default deferred;

    location / {
      return 301 https://$host$request_uri;
    }
  }

  server {
    charset utf-8;

    listen 443 default deferred ssl;

    send_timeout 120s;
    keepalive_timeout 5;
    client_max_body_size 4G;

    ssl_certificate /etc/letsencrypt/live/students.veda-kiev.org.ua/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/students.veda-kiev.org.ua/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

    root /assets/public;

    try_files $uri/index.html $uri.html $uri @app;

    location ~ ^/assets/ {
      root /assets/public;

      expires max;

      add_header Cache-Control public;

      gzip_static on;
    }

    location /__send_file_accel {
      internal;
      alias /assets/uploads;
    }

    location /.well-known/acme-challenge/ {
      root /var/www/certbot;
    }

    location @app {
      proxy_set_header Host $http_host;
      proxy_set_header X-Sendfile-Type X-Accel-Redirect;
      proxy_set_header X-Accel-Mapping /home/app/students_crm/uploads/=/__send_file_accel/;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

      proxy_redirect off;

      proxy_pass http://application:3000;

      gzip on;
    }

    error_page 500 502 503 504 /500.html;

    location = /500.html {
      root /assets/public;
    }
  }
}