Query params in Angular 6 are lost in apache web server

This is our first Angular based project. The project renders the UI and is integrated with REST API based on Sprint Boot which is a separate project. The Angular UI is designed to be access with a link as shown below-

http://localhost:4200/productconfig?product=AB23423&user=john

This works as expected with dev environment i.e. its embedded server and development is done!

We are trying to deploy it in QA with Apache and the problem occurs. The issue that when it accessed it with following url in apache -

http://localhost:80/productconfig?product=AB23423&user=john

somehow, it looses all the query params! When product and user are retrieved, they are null! And the URL changes to just

http://localhost:80/productconfig loosing the query param part which never happened in the dev environment i.e. in node server.

Not sure why this happens!!! Can any body please point out and give me some pointers/directions towards the solutions?

I appreciate your help. Thank you.