Owin 自寄宿 asp.net web api

http://owin.org/

Owin 定义了webserver和webapplication之间的标准接口，目标就是为了解耦webapplication对webserver的依赖，

就是说以后可以轻松的建立一个轻量级的HttpServer,

1.Basic Sample Self Host

下面建立一个Basic Self Host Http Server Via Owin ，全部功能就是获取客户端的Http请求，然后做出回应，当发生Unhandled Exception的时候，会自动跳转到错误页，

Step1：

Install-Package Microsoft.Owin.SelfHost

Step2:Configuration in Startup.css

using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;

namespace OwinSelfHostBasic
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
app.UseErrorPage();

// For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=316888 app.Run(context => {
if (context.Request.Path.Value == "/fail")
{
throw new Exception("Random exception");
}
context.Response.ContentType = "text/plain";
return context.Response.WriteAsync("Hello, world.");
});
}
}
}

app.UseErrorPage();

为WebApplication指定错误页，

app.Run加入响应逻辑

Step3:指定监听端口

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OwinSelfHostBasic
{
class Program
{
static void Main(string[] args)
{
using (Microsoft.Owin.Hosting.WebApp.Start<Startup>("http://localhost:9000"))
{
Console.WriteLine("Press [enter] to quit...");
Console.ReadLine();
}
}
}
}

OK，一切准备就绪，启动这个Console程序，请求 http://localhost:9000/ 这个地址，看起来比NodeJS更加方便。

2.Self Host Web API using Owin

Step1:

Install-Package Microsoft.AspNet.WebApi.OwinSelfHost

Step2:Startup.cs

using Owin;
using System.Web.Http;

namespace OwinWebAPISelfHost
{
public class Startup
{
// This code configures Web API. The Startup class is specified as a type
// parameter in the WebApp.Start method.
public void Configuration(IAppBuilder appBuilder)
{
// Configure Web API for self-host.
HttpConfiguration config = new HttpConfiguration();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);

appBuilder.UseWebApi(config);
}
}
}

Step3：APIController

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;

namespace OwinWebAPISelfHost
{
public class ValuesController : ApiController
{
// GET api/values
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}
}
}

Step4：设置监听端口

using Microsoft.Owin.Hosting;
using System;
using System.Net.Http;

namespace OwinWebAPISelfHost
{
public class Program
{
static void Main()
{
string baseAddress = "http://localhost:9000/";

// Start OWIN host
using (WebApp.Start<Startup>(url: baseAddress))
{
// Create HttpCient and make a request to api/values
HttpClient client = new HttpClient();

var response = client.GetAsync(baseAddress + "api/values").Result;

Console.WriteLine(response);
Console.WriteLine(response.Content.ReadAsStringAsync().Result);

Console.ReadLine();
}

}
}
}

Step5：启动Console程序，这里我们看到返回的是Json格式的数据，当我们用火狐浏览器进行请求，会发现返回的是XML格式的数据,因为火狐浏览器默认的Accept为XML