vhost.conf

SOMETHING=$(cat <<'END_HEREDOC'
echo '

#upstream docker-staticapp {
#    server staticapp:80;
#}

#upstream docker-springboot {
#    server springboot:5050;
#}

server {
  listen 80;
  # listen 80 default_server;
  access_log   /var/log/app/access.log;
  error_log    /var/log/app/error.log;

  root /app;
  index index.html;

  location / {
    try_files $uri $uri/ /index.html =404;
  }

  location @springboot {
    proxy_pass http://localhost:5050;
    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
    proxy_redirect off;
    proxy_buffering off;
    proxy_set_header Host $host;

    #proxy_set_header Host $host;
    #proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    #proxy_set_header X-Forwarded-Proto $scheme;
    #proxy_set_header X-Forwarded-Port $server_port;
  }
  location  ~ "^(.*)/(api)" {
    root /usr/share/nginx/html;
    try_files $uri $uri/ @springboot;
  }
}' > ./default.conf
END_HEREDOC)

bash -c "${SOMETHING}"