Looking for logging into the Http 401 Page site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Http 401 Page site. After that you can login as usual with your login credentials.
https://webmasters.stackexchange.com/questions/24443/should-i-return-a-http-401-status-code-on-an-html-based-login-form
https://stackoverflow.com/questions/11714485/restful-login-failure-return-401-or-custom-response
https://airbrake.io/blog/http-errors/401-unauthorized-error
https://developer.mozilla.org/de/docs/Web/HTTP/Status/401
https://forum.ionicframework.com/t/redirect-to-login-page-if-response-status-401/96629
https://core.trac.wordpress.org/ticket/25446
https://www.lifewire.com/401-unauthorized-error-what-it-is-and-how-to-fix-it-2622934
https://www.easyname.de/de/support/hosting/158-was-bedeuten-http-fehlercodes-wie-zb-403-404-500
https://github.com/vmware/harbor/issues/3106
https://knowledgebase.progress.com/articles/Article/HTTP-401-testing-REST-form-authentication-in-Postman
https://en.wikipedia.org/wiki/Basic_access_authentication
https://httpd.apache.org/docs/2.4/mod/mod_auth_form.html
https://foswiki.org/Tasks/Item11515