Set Cache-Control Header for OData Response

Hi all,
I implemented method 'readEntityMedia' which is called via $value for an entity. As I do return a PDF file I like to set the response header 'Cache-Control' to a defined value which is 'max-age = 86400, public' in my case.

By default the 'Cache-Control' header is set to private. I tried to change the header by using method 'header' of the ODataResponseBuilder:

public ODataResponse readEntityMedia(GetMediaResourceUriInfo uriInfo, String contentType) throws ODataException {
...
ODataResponseBuilder responseBuilder = ODataResponse.fromResponse(EntityProvider.writeBinary(mimeTypeRequested, documentData));
				
responseBuilder
	.header("Cache-Control", "max-age = 86400, public")
	.header("Content-Disposition", "inline;filename=\"" + fileName + "\"");
				
return responseBuilder.build();

}

Unfortunately the response header now contains both:
Cache-Control:private
and
Cache-Control:max-age = 86400, public

which is not what I expected. By calling method 'header' of the ResponseBuilder I expect that if a header already exists it gets overwritten.

Best regards,
Alex