I created a nginx-proxy instance in a docker compose file:

  nginx-proxy:
    restart: always
    image: nginxproxy/nginx-proxy
    ports:
      - "80:80"
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./.server/vhost:/etc/nginx/vhost.d

My vhost is like this:

client_max_body_size 50m;

location /encrypt {
  client_max_body_size 350m;
}

The goal is to allow 350m on a specific route, 50m otherwise.

It seems there is a problem because now, my route /encrypt returns cors error.
In other cases, there is no cors error. Cors are configured via nodejs for the whole application.

I don't reproduce this error without the nginx proxy.
How can I fix it?