public MediaType getContentType() {
		String value = getFirst(CONTENT_TYPE);
		return (StringUtils.hasLength(value) ? MediaType.parseMediaType(value) : null);
	}
public MediaType getContentType ( ) { String value = getFirst ( CONTENT_TYPE ) ; return ( StringUtils . hasLength ( value ) ? MediaType . parseMediaType ( value ) : null ) ; }
Return the {@linkplain MediaType media type} of the body, as specified
by the {@code Content-Type} header.
<p>Returns {@code null} when the content-type is unknown.