I have an existing system, which uses apache2 httpd server as the gateway. Currently, the gateway is using a client certificate to identify user, I would like to use Azure AD and OAuth2 to replace the authentication part, I found there is a plug-in for apache2 httpd to support OAuth2 (https://github.com/pingidentity/mod_auth_openidc), I don't know where is the end point that I should configure to validate the bearer token, I can get the OAuth2 authenticate and token endpoint from the Azure console, but seems it does not have the validate endpoint.
Anybody had experience in using apache2 httpd with Azure AD Oauth2 before? Is it a possible solution?