Do the thing ;-)

AdverCalculator.Server/AdverCalculator.Server.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
@@ -11,6 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.SpaProxy">
       <Version>8.*-*</Version>
     </PackageReference>

AdverCalculator.Server/AdverCalculator.Server.http

@@ -1,6 +1,6 @@
 @AdverCalculator.Server_HostAddress = http://localhost:5129
 
-GET {{AdverCalculator.Server_HostAddress}}/weatherforecast/
+GET {{AdverCalculator.Server_HostAddress}}/add
 Accept: application/json
 
 ###

AdverCalculator.Server/CalculatorEndpoints.cs

@@ -0,0 +1,12 @@
+namespace AdverCalculator.Server;
+
+public static class CalculatorEndpoints
+{
+    public static void Map(WebApplication app)
+    {
+        app.MapGet("/add", (double left, double right) => Task.FromResult(left + right)).WithName("Add").WithOpenApi();
+        app.MapGet("/subtract", (double left, double right) => Task.FromResult(left - right)).WithName("Subtract").WithOpenApi();
+        app.MapGet("/multiply", (double left, double right) => Task.FromResult(left * right)).WithName("Multiply").WithOpenApi();
+        app.MapGet("/divide", (double left, double right) => Task.FromResult(left / right)).WithName("Divide").WithOpenApi();
+    }
+}

AdverCalculator.Server/Controllers/WeatherForecastController.cs

@@ -1,33 +0,0 @@
-using Microsoft.AspNetCore.Mvc;
-
-namespace AdverCalculator.Server.Controllers
-{
-    [ApiController]
-    [Route("[controller]")]
-    public class WeatherForecastController : ControllerBase
-    {
-        private static readonly string[] Summaries = new[]
-        {
-            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-        };
-
-        private readonly ILogger<WeatherForecastController> _logger;
-
-        public WeatherForecastController(ILogger<WeatherForecastController> logger)
-        {
-            _logger = logger;
-        }
-
-        [HttpGet(Name = "GetWeatherForecast")]
-        public IEnumerable<WeatherForecast> Get()
-        {
-            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
-                TemperatureC = Random.Shared.Next(-20, 55),
-                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
-            })
-            .ToArray();
-        }
-    }
-}

AdverCalculator.Server/Program.cs

@@ -1,9 +1,7 @@
+using AdverCalculator.Server;
+
 var builder = WebApplication.CreateBuilder(args);
 
-// Add services to the container.
-
-builder.Services.AddControllers();
-// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
@@ -12,6 +10,7 @@ var app = builder.Build();
 app.UseDefaultFiles();
 app.UseStaticFiles();
 
+
 // Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {
@@ -21,9 +20,7 @@ if (app.Environment.IsDevelopment())
 
 app.UseHttpsRedirection();
 
-app.UseAuthorization();
-
-app.MapControllers();
+CalculatorEndpoints.Map(app);
 
 app.MapFallbackToFile("/index.html");
 

AdverCalculator.Server/WeatherForecast.cs

@@ -1,13 +0,0 @@
-namespace AdverCalculator.Server
-{
-    public class WeatherForecast
-    {
-        public DateOnly Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string? Summary { get; set; }
-    }
-}