Has anyone seen a solution where they can inspect the progress of file downloads from the server side of a dotnet Core WebApplication? The use case I have is:

1. A client GUI application spins up the web server with the code at the bottom of this post.
2. Another thread commands an IoT device to download the file.
3. The GUI application shows the progress of the download.

Is anyone aware of any hook or event I can use to inform some progress indicator on the GUI? Please let me know! Thank you very much.

Here’s the code. It’s a very minimal function that serves some static files using basic dotnet.

private void RunServer(string configPath)
{
    var builder = WebApplication.CreateBuilder();
    var app = builder.Build();

    app.UseStaticFiles(new StaticFileOptions()
    {
        FileProvider = new PhysicalFileProvider(configPath),
        ServeUnknownFileTypes = true,
        DefaultContentType = "text/plain"
    });

    app.Run(FileServer);
}

I’ve tried using the built-in OnPrepareResponse event, but that only shows the file request before the headers are sent and doesn’t give me any insight into the download itself. I also read the docs for the static file middleware and I don’t see anything that fits this use case.

Anything helps! Thank you again.