@Nullable
    default AggregatedHttpResponse response() {
        final ResponseHeaders headers = headers();
        if (headers == null) {
            return null;
        } else {
            final HttpData content = content();
            assert content != null;
            return AggregatedHttpResponse.of(headers, content);
        }
    }
Returns the {@link AggregatedHttpResponse} generated from this file.

@return the {@link AggregatedHttpResponse} of the file, or {@code null} if the file does not exist.
core/src/main/java/com/linecorp/armeria/server/file/AggregatedHttpFile.java