Streaming output asynchronously in spring boot

We are using spring boot in our application and return ResponseEntity<String> from our service method. The drawback of this is that we need to load whole result in the memory and due to memory requirement increases. We had a requirement to dump data from database to as CSV to the client. The total amount of data can be huge and we can't afford to load whole data in memory. 

What we were looking for was a way to dump data to result in chunks so that memory requirement does not increase. While searching the internet I came across this article which explains asynchronous processing of the http requests in spring boot. This page was really helpful in solving our problem. I am not copying any part of this article in my post. You can read the article directly at

https://medium.com/swlh/streaming-data-with-spring-boot-restful-web-service-87522511c071