Web API 2 POST-Request does not work on mono

Question

I want to write a REST-Server with WEB API 2 on a Linux machine with mono without IIS or something like that.

What I've done:

• Created an empty C # console console.

• Added Nuget package: Microsoft.AspNet.WebApi.OwinSelfHost, WebApi.Cors for processing CORS request

• Then I created Startup.cs to determine my configuration;

  public class Startup
  {
      public void Configuration(IAppBuilder app)
      {
          app.UseWebApi(ConfigureWebApi());
      }
  
      private HttpConfiguration ConfigureWebApi()
      {
  
          var config = new HttpConfiguration();
          var cors = new EnableCorsAttribute("*", "*", "*");
          config.EnableCors(cors);
          //Attribute Routing aktivieren
          config.MapHttpAttributeRoutes();
          config.Routes.MapHttpRoute(
  
              "DefaultApi",
  
              "api/{controller}/{id}",
  
              new { id = RouteParameter.Optional });
  
          return config;
      }
  }
  

• Modify my .cs program to act as a server

      class Program
      {
      static void Main(string[] args)
      {
          string baseUrl = "http://*:5000";
          using (WebApp.Start<Startup>(baseUrl))
          {
              Console.WriteLine("Press Enter to quit.");
              Console.ReadKey();
  
          }
      }
  }
  

• At this point I add a model class book

  public class Book
  {
      public String Name { get; set; }
      public String Author { get; set; }
  
      public int Id { get; set; }
  }
  

• And exit with BooksController, which should handle requests:

  public class BooksController : ApiController
  {
      public BooksController()
      {}
  
      public async Task<IHttpActionResult> Get()
      {
          List<Book> list = new List<Book>();
          list.Add(new Book() { Name = "myBook",Author = "John" ,Id=1});
          list.Add(new Book() { Name = "myBook2",Author = "Peter",Id=2 });
          return Ok(list);
      }
  
      public async Task<IHttpActionResult> Post(Book requestData)
      {
          return Created<Book>("api/books/" + requestData.Id, requestData);
      }
  }
  

I started this whole application on a Linux machine with mono 4.0.2. And test the application with "postman" -Application to create various HTTP requests.

I tested the server using the GET request / api / books and it works!

, POST-, " 500", .

POST-

, Windows .NET Framework, POST- !

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Answer 1

, CORS Mono.

CORS, . , , : https://github.com/SEEK-Jobs/whatsupwithmono/issues/6

/// <summary>
/// Work around a bug in mono implementation of System.Net.Http where calls to HttpRequestMessage.Headers.Host will fail unless we set it explicitly.
/// This should be transparent and cause no side effects.
/// </summary>
private class MonoPatchingDelegatingHandler : DelegatingHandler {
    protected async override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) {
        request.Headers.Host = request.Headers.GetValues("Host").FirstOrDefault();
        return await base.SendAsync(request, cancellationToken);
    }
}

ConfigureWebApi config.EnableCors :

if(Type.GetType("Mono.Runtime") != null) {
    config.MessageHandlers.Add(new MonoPatchingDelegatingHandler());
}
config.EnableCors();

Answer 2

: -)

CORS, !

Windows , Linux POST- !

Cors Lines, .