If you need to set up ZAP to handle authentication then you really need to find a suitable verification URL in your app.
The verification URL will be one that you can request from the Manual Request Editor dialog and which will send a response that allows you to work out whether you are logged in or not. What that looks like will entirely depend on your app, but could be something like:
- Any page or API endpoint which returns the authenticated user’s Id
- A user details page or API endpoint
- A user preferences page or API endpoint
- A page containing a login link
- A page containing a logout link
For traditional apps this may be easy to find - all HTML responses may give you enough information.
Modern Single Page Apps may take more time to find a suitable URL.
Explore your app manually with a browser proxied through ZAP while authenticated and examine all of the responses from the app. Look for anything in the browser which indicated you are logged in, then search for that string in the responses returned to ZAP. Once you have identified a potential URL then logout and make sure that the response is different.
If your app supports authentication then you will be able to find a verification URL like this - if the app responds exactly the same to all authenticated and unauthenticated requests then there would be no point in supporting authentication.