Thanks to your answer.
I'm afraid I didn't have enough explanation.
Again, I downloaded the Apache-Tomcat 8.5.37 version from the https://tomcat.apache.org/download-80.cgi page.
And we created a test folder in the webppas folder and created a single page with files like Index.html inside.
Access the http://{Apache-Tomcat Server IP}:80/Test URL to view the page that I created.
We also created a button on the Main page so that the page could be switched by pressing that button (three of these buttons were created, each switching to a different page).
Here's what I think.
1. Access the main page and press any one of the three buttons.
2. Redirected to the Gluu authentication page and certified as OpenID Connection in Gluu.
3. Once certified, access the remaining two pages without authorization.
However, I don't know how to set it up in Gluu or Apache-Tomcat.
Please provide me with the relevant materials or guides.