/usr/lib/swipl/library/ext/ssl/ssl.pl
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 cert_accept_any(+SSL, +ProblemCertificate, +AllCertificates, +FirstCertificate, +Error) is det
Implementation for the hook `cert_verify_hook(:Hook)` that accepts any certificate. This is intended for http_open/3 if no certificate verification is desired as illustrated below. 
  http_open('https:/...', In,
            [ cert_verify_hook(cert_accept_any)
            ])