I’m trying to make an Attribute to Encrypt response of an Api.

This is the Attribute Code

public class MyCustomFilter : ActionFilterAttribute {
    private MemoryStream responseBody;

    public override void OnActionExecuting(ActionExecutingContext context) {
        responseBody = new MemoryStream();
        context.HttpContext.Response.Body = responseBody;
    }

    public override async void OnResultExecuted(ResultExecutedContext context) {
        responseBody.Seek(0, SeekOrigin.Begin);
        using (StreamReader sr = new(responseBody)) {
            string actionResult = await sr.ReadToEndAsync();
            string j = AesOperation.EncryptString("b14ca5898a4e4133bbce2ea2315a1916", actionResult);
            Console.WriteLine("LLL");
            Console.WriteLine(j);

            context.HttpContext.Response.ContentType = "text/plain";
            await context.HttpContext.Response.WriteAsync(j);
        }

        base.OnResultExecuted(context);
    }
}

And This is The Api

[HttpGet]
[MyCustomFilter]
public ActionResult<GenericResponse<EnumDto>> Read() => repository.ReadAppSettings();

And Here is the Error I’m getting

Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HN5FN3JH41NQ", Request id "0HN5FN3JH41NQ:00000001": An unhandled exception was thrown by the application.
      System.InvalidOperationException: Response Content-Length mismatch: too few bytes written (0 of 12847).