#!/bin/sh
ua="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36"

test -z "${url:=$1}" &&
	url="$(cat /dev/stdin)"

echo "url: $url" >&2
curl -s -H "$ua" "$url"| 
	pup 'link[title=RSS] attr{href}'