endpoint ProtocolClient = 13
{
    // Download notifications
    DownloadProgress(i32 download_id, Optional<u32> total_size, u32 downloaded_size) =|
    DownloadFinished(i32 download_id, bool success, Optional<u32> status_code, u32 total_size, i32 shbuf_id, IPC::Dictionary response_headers) =|
}