oneliner to extract links from the target itself

olink.sh

while read h; do curl -siL https://$h|sed -n -E "s/.*<.*(href|src|url)[=:]['\"]?([^'\">]+).*/\2/p" ; done < hosts.txt

function olink {
  curl -siL https://$1|sed -n -E "s/.*(href|src|url)[=:]['\"]?([^'\">]+).*/\2/p"
}

function olinks {
  while read h; do curl -siL https://$h|sed -n -E "s/.*<.*(href|src|url)[=:]['\"]?([^'\">]+).*/\2/p" ; done < $1
}