Migrating nginx config to OpenBSD's httpd

Hi all,

I am trying to migrate nginx configuration to OpenBSD's httpd. All it is
working ok, except for some proxy reverse config that I use with nginx's
config, like for example:

server {
listen 80;
server_name internal.w01.domain.org;

location / {
proxy_pass http://192.168.30.4;
}
}

I don't see what is the option to use with httpd.conf or is it best
option to use relayd.conf for this type of configs?

Thanks.