private static ResponseHeadersBuilder responseHeadersBuilder(HttpStatus status,
                                                                 MultivaluedMap<String, Object> headers) {
        final ResponseHeadersBuilder builder = ResponseHeaders.builder(status);
        headers.forEach(builder::addObject);
        return builder;
    }
Implements {@link org.jboss.resteasy.spi.HttpResponse}.
resteasy/src/main/java/com/linecorp/armeria/server/resteasy/ResteasyHttpResponseImpl.java