I am trying to expose my two springboot applications to the external network which are on AWS storage and I'm getting my head blown because I can't make one of them reach another one. The first application, let's call it A, it returns the rest page with a number:123, the second one is returning the name of host specified in deployment file of first application: let's say hostname: datahost. It has a method /getnumber which returns this number when put into web browser. It's working on 8080 port.

The point is that the second application has a return statement of "http://datahost:8080/getnumber", which should be returning the result of first application /getnumber result. Unfortunately the return statement is:

There was an unexpected error (type=Internal Server Error, status=500). I/O error on GET request for "http://datahost:8080/getnumber": datahost; nested exception is java.net.UnknownHostException: datahost

Can u guys explain or give a tip how to make those applications be visible for eachother? They are both in two another pods and in the same node. Furthermore if I use it on localhost on a computer and forward it to localhost:8080/getnumber, then it works.