spring-projects/spring-framework — pull request #443 by snicoll (2014-01-17 15:45:31+00:00)
Title: SPR-11129: Handling of HttpHeaders as controller return type

This commit permits to produce a response with only custom headers by
returning a `HttpHeaders` instance. Previously, one has to wrap that
`HttpHeaders` instance in a `ResponseEntity`

Simply returning the `HttpHeaders` instance directly as the same effect now.