As you may know, you can publish internal web applications using Azure AD Application Proxy.
Until now, when you had to publish multiple different internal URLs, you had to create one Application Proxy for each URL.
Well, good news as now you can publish multiple internal web application using only one Application Proxy.
The first thing to do is to create a wildcard Application Proxy as documented here https://learn.microsoft.com/en-us/azure/active-directory/app-proxy/application-proxy-wildcard#create-a-wildcard-application.
Then you need to edit this new wildcard application to add application segments – each segment will be each individual internal web application from the Application proxy\Basic blade
When creating a segment, you can define the corresponding internal and external URL, CORS settings (optional)
The good news is if you already have created individual Application Proxy for your internal web applications, you don’t need to delete them first
Keep in mind that when you create a wildcard Application Proxy and segments, some settings – such as assignments, SSO… – apply to all segments
Another great new improvement for Azure AD Application Proxy is you can now also validate the backend SSL certificate by accessing the Application proxy\Advanced blade
If you implement a wildcard application with segments, this options is being automatically enabled