Hi @Pradeep Sadashivamurthy
I'm not sure if you are using the default ports, or whether you have customized some of the ports. 9090 is usually the port for NiFi and not the schema registry. Schema Registry's default port, I think, is 7788. In addition, the Schema Registry has a very cool built-in tool to help making working with the APIs much easier. Try http://host.name:7788/api/swagger in a web browser, and see if the tool comes up, and go from there.
Hope this helps