RestClient multipart body InputStream issue

[QuentinTixier]

Hello,
I'm trying to send a torrent file to a qBitTorrent server through the quarkus rest client but I can't seem to make it work.
Here is my client method

@POST
@Path("/torrents/add")
@Consumes(MediaType.MULTIPART_FORM_DATA)
RestResponse<String> addTorrentByBinData(@RestForm("torrents") InputStream binTorrent);

And how I call it in my app (getEntity and getStatus are just for debugging)

public boolean addTorrent(InputStream binTorrent) {
    boolean spaceAvailable = availableDownloadCapacity > 0;
    if (spaceAvailable) {
        RestResponse<String> res = qBitTorrentApiClient.addTorrentByBinData(binTorrent);
        String entity = res.getEntity();
        res.getStatus();
    }
    return spaceAvailable;
}

I also tried sending using a File or a ClientMultipartForm instead of the InputStream without results.
Everytime qBitTorrent responds a 200 with "Fails." body and in the qbit server logs I can read

bool Http::RequestParser::parseRequestLine(const QString&) invalid http header: "1fa0"
Http::RequestParser::ParseResult Http::RequestParser::doParse(QByteArrayView) header parsing error
Bad Http request, closing socket. IP: ::ffff:172.19.0.1

I'm guessing the rest client isn't sending a correct HTTP request ? Or am I missing something ?
Also, I managed to use the endpoint through postman with a local file.