WebAPI and ODataController return 406 Not Acceptable

Question

Before adding OData to my project, my routes where set up like this:

       config.Routes.MapHttpRoute(
            name: \"ApiById\",
            routeTempl         


        

Answer 1

In my case (odata V3) I had to change name of OdataController to be same as provided in ODataConventionModelBuilder and that solved the issue

my controller:

public class RolesController : ODataController
{
    private AngularCRMDBEntities db = new AngularCRMDBEntities();

    [Queryable]
    public IQueryable GetRoles()
    {
        return db.tROLEs;
    }
}

ODataConfig.cs:

public class ODataConfig
{
    public static void Register(HttpConfiguration config)
    {
        ODataConventionModelBuilder modelBuilder = new ODataConventionModelBuilder();
        modelBuilder.EntitySet("RolesNormal"); 
        modelBuilder.EntitySet("Roles").EntityType.HasKey(o => o.IDRole).HasMany(t => t.tROLE_AUTHORIZATION);
        modelBuilder.EntitySet("Lookups").EntityType.HasKey(o => o.IDLookup).HasMany(t => t.tROLE_AUTHORIZATION);
        modelBuilder.EntitySet("RoleAuthorizations").EntityType.HasKey(o => o.IDRoleAuthorization);

        config.Routes.MapODataRoute("odata", "odata", modelBuilder.GetEdmModel());
        config.EnableQuerySupport();
    }
}

WebApiConfig.cs:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services

        // Web API routes
        config.MapHttpAttributeRoutes();
        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));            

        config.Routes.MapHttpRoute( //MapHTTPRoute for controllers inheriting ApiController
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
            );

        var jsonFormatter = config.Formatters.OfType().First();
        jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

        GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings
            .ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
        GlobalConfiguration.Configuration.Formatters
            .Remove(GlobalConfiguration.Configuration.Formatters.XmlFormatter);
    }
}

Global.asax:

public class WebApiApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        GlobalConfiguration.Configure(config =>
        {
            ODataConfig.Register(config); 
            WebApiConfig.Register(config);
        });            
    }
}