checkbot(1p) on Linux
The text 235c06907c3a, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it. The page shows this text now.
WWW Link Verifier
Flags it lists
-
--allow-simple-hosts -
--cookies -
--debug -
--enable-virtual -
--help -
--internal-only -
--interval -
--language -
--note -
--sleep -
--suppress -
--timeout -
--verbose