How can I close haproxy frontend connections coming from unknown hosts?

Now I am using nginx to close connections from unknown hosts and return 444 "no response"

How do I achieve the same with haproxy which is in front of nginx (saving the extra step between haproxy and nginx)

current nginx config:

server {
  # Close connection for unrecognized hosts (444 no response)
  listen 80 default_server;
  listen [::]:80 default_server;

  return 444;
}

Solution

This can be achieved using "silent-drop"

acl host_example req.hdr(host) -i example.com
http-request silent-drop if not host_example