빠른 답변에 정말 감사합니다!
SSO 로그를 verbose로 설정한 후 production.log에서 발견한 내용은 다음과 같습니다:
Started GET "/session/csrf" for <IP> at 2020-07-24 14:32:51 +0000
Processing by SessionController#csrf as JSON
Completed 200 OK in 1ms (Views: 0.1ms | ActiveRecord: 0.0ms | Allocations: 321)
Started POST "/auth/saml" for <IP> at 2020-07-24 14:32:51 +0000
(saml) Request phase initiated.
Started POST "/auth/saml/callback" for <IP> at 2020-07-24 14:33:23 +0000
(saml) Callback phase initiated.
Processing by Users::OmniauthCallbacksController#complete as HTML
Parameters: {"SAMLResponse"=>"<SNIP>", "provider"=>"saml"}
Redirected to https://discourse-imphys.tudelft.nl/
Completed 302 Found in 24ms (ActiveRecord: 0.0ms | Allocations: 10562)
Started GET "/" for <IP> at 2020-07-24 14:33:24 +0000
Processing by ListController#latest as HTML
Rendering list/list.erb within layouts/application
Rendered list/list.erb within layouts/application (Duration: 3.8ms | Allocations: 1991)
Rendered layouts/_head.html.erb (Duration: 1.9ms | Allocations: 911)
Rendered common/_discourse_stylesheet.html.erb (Duration: 0.4ms | Allocations: 267)
Rendered application/_header.html.erb (Duration: 2.2ms | Allocations: 1022)
Completed 200 OK in 34ms (Views: 13.1ms | ActiveRecord: 0.0ms | Allocations: 15963)
Started GET "/u/hp.json" for <IP> at 2020-07-24 14:33:24 +0000
Processing by UsersController#get_honeypot_value as JSON
Completed 200 OK in 2ms (Views: 0.2ms | ActiveRecord: 0.0ms | Allocations: 812)
Started GET "/u/check_username?username=&email=94422472fbfb32fdd22eaa2f88c723fb44be9958" for <IP> at 2020-07-24 14:33:25 +0000
Processing by UsersController#check_username as JSON
Parameters: {"username"=>"", "email"=>"94422472fbfb32fdd22eaa2f88c723fb44be9958"}
Completed 200 OK in 1ms (Views: 0.2ms | ActiveRecord: 0.0ms | Allocations: 316)
Started GET "/u/check_username?username=94422472fbfb32fdd22e&email=94422472fbfb32fdd22eaa2f88c723fb44be9958" for <IP> at 2020-07-24 14:33:25 +0000
Processing by UsersController#check_username as JSON
Parameters: {"username"=>"94422472fbfb32fdd22e", "email"=>"94422472fbfb32fdd22eaa2f88c723fb44be9958"}
Completed 200 OK in 3ms (Views: 0.2ms | ActiveRecord: 0.0ms | Allocations: 1421)
인증서를 <SNIP>로, IP 주소를 <IP>로 대체했습니다.