public static List<String> asList(Bundle bundle, String headerName) {
        return ContainerBuilder.safeStringSplit(bundle.getHeaders().get(headerName), ",");
    }
This method reads the named header from the manifest of the given bundle, and parses it as a comma-separated list
of values. If the header is not set, this method returns an empty list.

@param bundle     The bundle whose manifest to parse the header from.
@param headerName The name of the header to parse.
@return A list of parsed header values, may be empty.
jdisc_core/src/main/java/com/yahoo/jdisc/application/OsgiHeader.java