nginx.conf

server {
  listen 80;
  server_name s3gw-ui-proxy;

  location / {
    proxy_pass http://s3gw-ui:8080/;
  }
}

server {
  listen 3080;
  server_name s3gw-proxy;

  location / {

    if ($request_method = 'OPTIONS') {
      add_header 'Access-Control-Max-Age' 1728000;
      add_header 'Access-Control-Allow-Origin' '*';
      add_header 'Access-Control-Allow-Headers' '*';
      add_header 'Access-Control-Allow-Methods' 'DELETE,GET,HEAD,POST,PUT';
      add_header 'Content-Type' 'application/json';
      add_header 'Content-Length' 0;
      return 204;
    }

    add_header 'Access-Control-Allow-Origin' '*' always;
    add_header 'Access-Control-Allow-Headers' '*' always;
    add_header 'Access-Control-Allow-Methods' 'DELETE,GET,HEAD,POST,PUT' always;

    proxy_pass http://s3gw:7480/;
  }
}