...
Shibboleth - https://<sp>/Shibboleth.sso/Login
Satosa - https://<sp>/Saml2SP/disco
SimpleSAMLphp - https://<sp>/simplesaml/module.php/saml/sp/discoresp.php
If your version of SimpleSAML doesn’t have this support, the fallback is to add this information manually
Canvas - https://<sp>/login/saml