Try setting the User-Agent string to something a real browser sends, e.g.
.
Tried that, getting a 503 now. I also noticed the site is protected by Cloudflare. Now you enter dangerous waters.
apply only to users that agreed to the terms (read: who are logged in), it's ok to scrape a site even if they don't want you too. Bypassing cloudflare and similar measures however is outright hacking and illegal in most places.