Bad link or Internal server error?

In Googling for swi prolog predicate indicator dcg (results) for result

Notation of Predicate Descriptions - SWISH -- SWI-Prolog

received link for

https://swish.swi-prolog.org/pldoc/man?section=preddesc

which results in Internal server error.

Not a problem for me, just noting it in case something needs to be done.