Testing request timeout in C# ASP.NET Core 8 Web API locally

I'm attempting to test request timeout functionality in a C# ASP.NET Core 8 Web API on my local environment.

Here's my setup: in Program.cs, I've configured middleware using AddRequestTimeouts and UseRequestTimeouts. I've defined a default policy and an additional policy named ThreeSecondsPolicy. I've set Timeout, TimeoutStatusCode, and WriteTimeoutResponse properties for both policies.

Here's a snippet of the relevant code from Program.cs:

    builder.Services.AddRequestTimeouts(options =>    {        options.DefaultPolicy = new RequestTimeoutPolicy         {             Timeout = TimeSpan.FromMilliseconds(100),            TimeoutStatusCode = (int)HttpStatusCode.RequestTimeout,            WriteTimeoutResponse = async (HttpContext context) =>            {                context.Response.ContentType = "text/plain";                await context.Response.WriteAsync("Timeout from Default Policy!");            }        };        options.AddPolicy("ThreeSecondsPolicy", new RequestTimeoutPolicy        {            Timeout = TimeSpan.FromMilliseconds(3000),            TimeoutStatusCode = (int)HttpStatusCode.RequestTimeout,            WriteTimeoutResponse = async (HttpContext context) =>            {                context.Response.ContentType = "text/plain";                await context.Response.WriteAsync("Timeout from ThreeSecondsPolicy!");            }        });    });    app.UseRequestTimeouts();

In my controller method, annotated with [RequestTimeout(policyName: "ThreeSecondsPolicy")]

Here's a snippet of the controller and service method:

    [Route("/details")]    [HttpGet]    [RequestTimeout(policyName: "ThreeSecondsPolicy")]    public async Task<ActionResult<StudentResponse>> GetstudentDetails([Required, FromQuery] string studentId)    {        try        {            StudentResponse StudentResponse = await factory.Service.ExecuteStudentDetails(studentId, HttpContext.RequestAborted);            if (StudentResponse != null && StudentResponse.studentDetails != null)            {                if (StudentResponse.studentDetails.Any())                {                    StudentResponse.ActionResult = new StudentDetailsActionResult { Code = HttpStatusCode.OK, Messages = new List<string> { "Success" } };                    return Ok(StudentResponse);                }                else                {                    LogException(HttpStatusCode.OK, new List<string> { "Empty result" });                    StudentResponse = new StudentResponse                    {                        ActionResult = new StudentDetailsActionResult { Code = HttpStatusCode.OK, Messages = new List<string> { "Empty result" } }                    };                    return StatusCode(200, StudentResponse);                }            }               }        catch (Exception ex)        {            LogException(HttpStatusCode.InternalServerError, new List<string> { ex.ToString() });            return StatusCode(500, ex.Message);        }    }    public async Task<StudentResponse> ExecuteStudentDetails( string id, CancellationToken token)    {        token.ThrowIfCancellationRequested();        try        {            var studentData = await dataAccessHelper.GetStudentData(id);            StudentResponseMapper studentResponseMapper = factory.CreateStudentResMapper();            var data = studentResponseMapper.MapResponse(studentData);            return data;        }        catch (OperationCanceledException)        {            // Return a custom response indicating a request timeout (408 status code with a custom message)            var timeoutResponse = new StudentResponse            {                // You can customize the response message as needed                ActionResult = new StudentDetailsActionResult                {                    Code = HttpStatusCode.RequestTimeout,                    Messages = new List<string> { "Request timed out" }                }            };            return timeoutResponse;        }    }

I'm running the application without the debugger attached, as recommended by Microsoft's documentation.

While testing, I'm observing the following:

• Timeout functionality is working as expected in Postman.
• However, I'm not receiving the expected status code 408 or the custom message set in WriteTimeoutResponse property in Program.cs.

How can I resolve these issues and accurately get status code with custom message?

Any insights or suggestions would be greatly appreciated. Thank you!