Add project files.

DemoSolution.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.7.34024.191
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OwinDemo", "OwinDemo\OwinDemo.csproj", "{3DD6938D-773D-4B0E-9C84-F3569351ADAD}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RESTfulServicesDemo", "RESTfulServicesDemo\RESTfulServicesDemo.csproj", "{15081B66-788C-44EF-919B-02D82D853FC5}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3DD6938D-773D-4B0E-9C84-F3569351ADAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3DD6938D-773D-4B0E-9C84-F3569351ADAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3DD6938D-773D-4B0E-9C84-F3569351ADAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3DD6938D-773D-4B0E-9C84-F3569351ADAD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{15081B66-788C-44EF-919B-02D82D853FC5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{15081B66-788C-44EF-919B-02D82D853FC5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{15081B66-788C-44EF-919B-02D82D853FC5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{15081B66-788C-44EF-919B-02D82D853FC5}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B748D3D8-2126-466C-8490-A6E9000FC5AB}
+	EndGlobalSection
+EndGlobal

OwinDemo/Controllers/WeatherForecastController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace OwinDemo.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 = DateTime.Now.AddDays(index),
+                TemperatureC = Random.Shared.Next(-20, 55),
+                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
+            })
+            .ToArray();
+        }
+    }
+}

OwinDemo/OwinDemo.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Owin" Version="6.0.21" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />
+  </ItemGroup>
+
+</Project>

OwinDemo/Program.cs

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+using System.Globalization;
+using System.Net.WebSockets;
+using System.Text;
+
+namespace OwinDemo
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            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();
+
+            var app = builder.Build();
+
+            // Configure the HTTP request pipeline.
+            if (app.Environment.IsDevelopment())
+            {
+                //app.UseSwagger();
+                //app.UseSwaggerUI(); 
+                app.UseOwin(pipeline =>
+                {
+                    pipeline(next => OwinHello);
+                });
+            }
+
+            app.UseHttpsRedirection();
+
+            app.UseAuthorization();
+
+
+            app.MapControllers();
+
+            app.Run();
+        }
+        public static Task OwinHello(IDictionary<string, object> environment)
+        {
+            string responseText = "Hello World via OWIN";
+            byte[] responseBytes = Encoding.UTF8.GetBytes(responseText);
+
+            // OWIN Environment Keys: https://owin.org/spec/spec/owin-1.0.0.html
+            var responseStream = (Stream)environment["owin.ResponseBody"];
+            var responseHeaders = (IDictionary<string, string[]>)environment["owin.ResponseHeaders"];
+
+            responseHeaders["Content-Length"] = new string[] { responseBytes.Length.ToString(CultureInfo.InvariantCulture) };
+            responseHeaders["Content-Type"] = new string[] { "text/plain" };
+
+            return responseStream.WriteAsync(responseBytes, 0, responseBytes.Length);
+        }
+    }
+}

OwinDemo/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:24718",
+      "sslPort": 44337
+    }
+  },
+  "profiles": {
+    "OwinDemo": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7188;http://localhost:5269",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

OwinDemo/WeatherForecast.cs

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+namespace OwinDemo
+{
+    public class WeatherForecast
+    {
+        public DateTime Date { get; set; }
+
+        public int TemperatureC { get; set; }
+
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+        public string? Summary { get; set; }
+    }
+}

OwinDemo/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

OwinDemo/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

RESTfulServicesDemo/Controllers/ValueController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace RESTfulServicesDemo.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class ValueController : Controller
+    {
+        [HttpGet]
+        public IActionResult Get()
+        {
+            return Ok(new string[] {"value1", "value2"});
+        }
+
+        [HttpGet("one")]
+        public IEnumerable<string> Get1()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        [HttpGet("two")]
+        public ActionResult<IEnumerable<string>> Get2()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        [HttpGet("three")]
+        public string[] Get3()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        [HttpGet("four")]
+        public IActionResult Get4()
+        {
+            return new JsonResult(new string[] { "value1", "value2" });
+        }
+    }
+}

RESTfulServicesDemo/Controllers/WeatherForecastController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace RESTfulServicesDemo.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 = DateTime.Now.AddDays(index),
+                TemperatureC = Random.Shared.Next(-20, 55),
+                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
+            })
+            .ToArray();
+        }
+
+        [HttpPost]
+        public IActionResult Post(WeatherForecast weatherForecast)
+        {
+            return Ok();
+        }
+
+        [HttpPost("Body")]
+        public IActionResult PostBody([FromBody]WeatherForecast weatherForecast)
+        {
+            return Ok(weatherForecast);
+        }
+
+        [HttpPost("Form")]
+        public IActionResult PostForm([FromForm]WeatherForecast weatherForecast)
+        {
+            return Ok(weatherForecast);
+        }
+
+        [HttpPost("Route/{id}")]
+        public IActionResult PostRoute([FromRoute] string id)
+        {
+            return Ok(id);
+        }
+
+        [HttpPost("Query")]
+        public IActionResult PostQuery([FromQuery(Name ="Summary")] string summary)
+        {
+            return Ok(summary);
+        }
+    }
+}

RESTfulServicesDemo/Program.cs

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+namespace RESTfulServicesDemo
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var builder = WebApplication.CreateBuilder(args);
+
+            // Add services to the container.
+
+            builder.Services.AddControllers()
+                .ConfigureApiBehaviorOptions(options =>
+                {
+                    //options.SuppressModelStateInvalidFilter = true;
+
+                    ////Suppress all binding refernence
+                    //options.SuppressInferBindingSourcesForParameters = true;
+
+                    ////Suppress multipart/form-data content type reference
+                    //options.SuppressConsumesConstraintForFormFileParameters = true;
+                })
+                ;
+            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+            builder.Services.AddEndpointsApiExplorer();
+            builder.Services.AddSwaggerGen();
+
+            var app = builder.Build();
+
+            // Configure the HTTP request pipeline.
+            if (app.Environment.IsDevelopment())
+            {
+                app.UseSwagger();
+                app.UseSwaggerUI();
+            }
+
+            app.UseHttpsRedirection();
+
+            app.UseAuthorization();
+
+
+            app.MapControllers();
+
+            app.Run();
+        }
+    }
+}

RESTfulServicesDemo/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:31953",
+      "sslPort": 44370
+    }
+  },
+  "profiles": {
+    "RESTfulServicesDemo": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7094;http://localhost:5159",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}