Example of Nginx Front and API

nginx.conf

upstream api {
  server 127.0.0.1:3000 max_fails=0;
}

server {
  listen 80;
  listen [::]:80;

  server_name dominio-aqui;

  rewrite_log on;
  merge_slashes     off;

  # logging
  access_log /var/log/nginx/dominio-aqui.access.log;
  error_log  /var/log/nginx/dominio-aqui.error.log warn;

  # gzip
  gzip              on;
  gzip_vary         on;
  gzip_proxied      any;
  gzip_comp_level   6;
  gzip_types        text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

  # assets, media
  location ~* \.(?:css(\.map)?|js(\.map)?|jpe?g|png|gif|ico|cur|heic|webp|tiff?|mp3|m4a|aac|ogg|midi?|wav|mp4|mov|webm|mpe?g|avi|ogv|flv|wmv)$ {
    expires    7d;
    access_log off;
  }

  # svg, fonts
  location ~* \.(?:svgz?|ttf|ttc|otf|eot|woff2?)$ {
    add_header Access-Control-Allow-Origin "*";
    expires    7d;
    access_log off;
  }

  # favicon.ico
  location = /favicon.ico {
    log_not_found off;
    access_log    off;
  }

  # robots.txt
  location = /robots.txt {
    log_not_found off;
    access_log    off;
  }

  # svg, fonts
  location ~* \.(?:svgz?|ttf|ttc|otf|eot|woff2?)$ {
    add_header Access-Control-Allow-Origin "*";
    expires    max;
    access_log off;
  }

  # html files
  location ~* ^.+\.(html|htm)$ {
    expires    off;
  }

  location /api {
    proxy_pass         http://api;
    proxy_redirect     off;

    proxy_set_header   Host             $host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

    client_max_body_size       10m;
    client_body_buffer_size    128k;

    proxy_connect_timeout      90;
    proxy_send_timeout         90;
    proxy_read_timeout         90;

    proxy_buffer_size          4k;
    proxy_buffers              4 32k;
    proxy_busy_buffers_size    64k;
    proxy_temp_file_write_size 64k;
  }

  location / {
    try_files $uri $uri/ /index.html;
    add_header Content-Security-Policy   "default-src 'self' http: https: data: blob: 'unsafe-inline' 'unsafe-eval'" always;
  }
}