HTTP 405 Errors after Publishing Web API 2 Applications – Plesk

I have a Web Api Controller and i have tested all actions on localhost and it works well.But when i Published it on Web Server,Just Actions with [HttpGet] works and [HttpPost] Actions return 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 retrun below response form server.I Used PostAsJsonAsync method but it says that The requested resource does not support http method 'GET'
Does any one know why?

{
StatusCode: 405, ReasonPhrase: ‘Method Not Allowed’, Version: 1.0, Content: System.Net.Http.StreamContent, Headers:
{
Pragma: no-cache
X-Powered-By-Plesk: PleskWin
Connection: close
Cache-Control: no-cache
Date: Fri, 29 Sep 2017 08:53:51 GMT
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Content-Length: 72
Allow: POST
Content-Type: application/json; charset=utf-8
Expires: -1
}}

And

“{“message”:”The requested resource does not support http method ‘GET’.”}”

I have the below in my web api config:

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();
    }
}

I have below handlers in 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>

I use this webapi2 application in my winform application.