http.client.RemoteDisconnected: Remote end closed connection without response

Common causes

• The server or a proxy closed a keep-alive connection just as it was reused.
• The server crashed or timed out while handling the request.
• A WAF or bot protection drops requests it considers automated.
• Plain HTTP sent to a port that expects TLS.

How to fix it

1. Retry idempotent requests with urllib3 Retry on a requests Session.
2. Check server and proxy logs at the time of the request.
3. Check the URL scheme and port match.
4. If a WAF is blocking you, use an API intended for programmatic access or ask the site owner.