404 when WebAPI 2 Controller is called - asp.net

Question

i have developed a simple WebAPI 2 Controller with only one Controller and some simple GET Methods. I have created for this a Visual Studio 2015 Emtpy ASP.Net Web Application and added a WebAPI 2 Controller to it.
I have published it to a Windows 2012 R2 Machine with IIS 8.5 and ASP.Net 4.0 installed on it. It has thelatest updates etc.
When i call the Method from a browser i get an error 404 - 0x80070002 Notification: MapRequestHandler
You can download my solution here: VS2015 WebAPI2 Solution
This is the error message:
This is my webapplication:
These are the handlers:
This is the WebApplication configuration:
This is the Application Pool configuration:
These are the ISAPI filters:
Has anybody an idea about the possible reason why this it not working?
This is my controller:
using System.Collections.Generic;
using System.Web.Http;
namespace WebApi2Routes1.Controllers
{
// [Controller wird api/Default in diesem Fall genommen, also Controller Name ohne 'Controller'
[RoutePrefix("api/[controller]")]
public class BuecherController : ApiController
{
// GET: api/buecher/default
// [HttpGet]
[Route("")]
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}
// GET: api/buecher/show
[Route("show")]
public string Show()
{
return "Show";
}
[Route("value/{id:int}")]
public string GetValue(int id)
{
return "value" + id.ToString();
}
}
}
This is my web.config
<?xml version="1.0" encoding="utf-8"?>
<!--
Weitere Informationen zum Konfigurieren Ihrer ASP.NET-Anwendung finden Sie unter
http://go.microsoft.com/fwlink/?LinkId=301879
-->
<configuration>
<appSettings></appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5.2"/>
<httpRuntime targetFramework="4.5.2"/>
</system.web>
<system.webServer>
<modules>
<remove name="UrlRoutingModule-4.0" />
<add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" preCondition="" />
</modules>
<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>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.codedom>
<compilers>
<compiler language="c#;cs;csharp" extension=".cs"
type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701"/>
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb"
type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+"/>
</compilers>
</system.codedom>
</configuration>
I this is the url which throws the error:
http://localhost:8080/api/buecher
and
http://localhost:8080/api/buecher/show
Update 1:
I also have a global.asax
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Routing;
namespace WebApi2Routes1
{
public class WebApiApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
GlobalConfiguration.Configure(WebApiConfig.Register);
}
}
}
and a WebApiConfig.cs
using Newtonsoft.Json.Serialization;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Formatting;
using System.Web.Http;
namespace WebApi2Routes1
{
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
// Web-API-Konfiguration und -Dienste
// Web-API-Routen
config.MapHttpAttributeRoutes();
// var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
// jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
}
}
}

Answer 1

Solved by myself. There where two issues:
[RoutePrefix("api/[controller]")]
[controller] as a token does not work! You have to replace it with a static string like "books" or anything else.
The second issue was that methods need an explicite HHTPGET or HTTPPOST etc. This does not work
[Route("show")]
public string Show()
{
return "Show";
}
This works
[Route("show")]
[HttpGet]
public string show()
{
return "Show";
}
Only if the Method itself is called Get() or Post() or ... then there is no need for [HttpGet].
After replacing the [controller] token in RoutePrefix by a static value and adding [HTTPGET] to the method it worked!