@Nullable
    private HttpData closeRequestDecoder() {
        if (decoderFinished) {
            return null;
        }
        decoderFinished = true;
        return requestDecoder.finish();
    }
A {@link FilteredHttpRequest} that applies HTTP decoding to {@link HttpObject}s as they are published.
core/src/main/java/com/linecorp/armeria/server/encoding/HttpDecodedRequest.java