Retrieve redirected URL

Hi,

In an application we are currently developing anonymous users can access the login page via a number of URL's which all redirect to our application. We want to make the content of the page dependent on the redirected URL. Currently we retrieve this URL and set an attribute based on it through JavaScript. The problem we encountered is that this occurs after the actual rendering of the page.

Is there some way to access this URL in a microflow instead so we can set attributes and conditional visibility based on these attributes before the page renders?