too many fat clunky penguins, need fix as soon as possible!

Is your feature request related to a problem? Please describe.
It takes far too long to test all URLs of a list (Slow Internet).
It would therefore be very good if you could check a list of URLs only for incorrect URLs.
Without DNS query or so, only a check if all URLs are correct and if no errors have occurred e.g. a dot at the end of a URL.

Describe the solution you'd like
When I