Simple web api using HttpListener

Program.cs

using System.Net;
using System.Text.Json;

namespace HttpListenerApplication;

class Program
{
    private record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
    {
        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
    }

    static async Task Main(string[] args)
    {
        var listener = new HttpListener();
        listener.Prefixes.Add("http://localhost:5032/");


        string[] summaries =
        [
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        ];

        listener.Start();

        while (listener.IsListening)
        {
            var context = await listener.GetContextAsync();

            Task.Run(async () =>
                {
                    if (context.Request.HttpMethod == "GET" && context.Request.RawUrl == "/weatherforecast/")
                    {
                        context.Response.ContentType = "application/json";
                        context.Response.StatusCode = 200;
                        var forecast = Enumerable.Range(1, 5).Select(index =>
                                new WeatherForecast
                                (
                                    DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                                    Random.Shared.Next(-20, 55),
                                    summaries[Random.Shared.Next(summaries.Length)]
                                ))
                            .ToArray();
                        var buffer = JsonSerializer.SerializeToUtf8Bytes(forecast);
                        context.Response.ContentLength64 = buffer.Length;
                        await context.Response.OutputStream.WriteAsync(buffer, 0, buffer.Length);
                    }
                    else
                    {
                        context.Response.StatusCode = 404;
                    }
                    context.Response.Close();
                }
            );
        }
    }
}