HTTP 405 Errors After Publishing Web API 2 Applications

Question

I have a web Api Controller and I tested all the actions on localhost and it works well. But when I posted it on a web server, Just Actions c [HttpGet]works and [HttpPost]Actions return an Http 405 error

public class ContentController : ApiController
{
    [HttpGet]
    public async Task<IHttpActionResult> AdvantageList()
    {
        //return ok 200
    }
    [HttpPost]
    public async Task<IHttpActionResult> SaveAdvantage(ContentModel model)
    {
        //return 405 
    }
}

I used below method on client

var r = await ClientManager.Client.PostAsJsonAsync("api/Content/SaveAdvantage", Advantage);

But it will be retrieved below the response server. I used the method PostAsJsonAsync, but it says The requested resource does not support http method 'GET' Does anyone know why?

{ StatusCode: 405, ReasonPhrase: " ", : 1.0, : System.Net.Http.StreamContent, : {   Pragma: no-cache   X-Powered-By-Plesk: PleskWin   :   Cache-Control: no-cache   : , 29 2017 08:53:51 GMT   : Microsoft-IIS/8.0   X-AspNet-: 4.0.30319   X-Powered-By: ASP.NET   -: 72   : POST   Content-Type: application/json; = UTF-8   : -1 }}

"{\" message\ ": \" http 'GET'.\ "}"

- api:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Routes.MapHttpRoute("DefaultApi", "api/{controller}/{action}");
        config.Routes.MapHttpRoute("WithId", "api/{controller}/{action}/{id}", new { id = RouteParameter.Optional });
        config.Routes.MapHttpRoute("TwoId", "api/{controller}/{action}/{id}/{id2}", new { id = RouteParameter.Optional, id2 = RouteParameter.Optional });

        config.MapHttpAttributeRoutes();

        var formatter = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
        formatter.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver();
    }
}

Web.config

<system.webServer>
<handlers>
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <remove name="OPTIONSVerbHandler" />
  <remove name="TRACEVerbHandler" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
</system.webServer>

webapi2 winform.

Answer 1

http, , . : https://fr.wikipedia.org/wiki/Liste_des_codes_HTTP

Answer 2

- Preferred domain, none,

Answer 3

-. 405 http , -. , , , .