3.11 library(http/http_openid): OpenID consumer and server library
All Application Manual Name SummaryHelp

Availability::- use_module(library(http/http_openid)).
Sourceopenid_grant(+Request)
Handle the reply from checkid_setup_server/3. If the reply is yes, check the authority (typically the password) and if all looks good redirect the browser to ReturnTo, adding the OpenID properties needed by the Relying Party to verify the login.