.NET Web api 2 stops working after sometime in IIS

Question

I have two web API project DLLs in one solution.

Structure of my Project Solution:

In my solution, the projects are located as follows:

1) Base Solution

2) Base Web API

3) Module Web API

Hence, my solution is something like a BASE solution which contains many MODULES. Each Modules can contain its own Web APIs. Also, my Base Solution contains its own Web API

This is our structure.

My Problem:

It is working fine in my local run solution. When I host it to the IIS, it is working for few hours and then it stops working by throwing the error message "Error 404 found". When I try to access through URL directly which is something like " http://127.0.0.1:51/Products/Get ", not working.

Visual Studio version:

Visual Studio Professional - 2015

IIS Version:

IIS - 7.5.7600

My approach: I have a simple project which simulates this scenario. It has the same problem with my original project.

Web API For Base Module:

WepApiConfig under App_Start:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services
        // Configure Web API to use only bearer token authentication.
        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

        // Web API routes
        config.MapHttpAttributeRoutes();

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

Base API Controller:

public class ValuesController : ApiController
{
    // GET api/values
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    // GET api/values/5
    public string Get(int id)
    {
        return "value";
    }
}

WebApiConfig.cs For Module Web API:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services
        // Configure Web API to use only bearer token authentication.
        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

        // Web API routes
        //config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultModuleApi",
            routeTemplate: "api/module/{controller}/{action}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}

Module API Controller:

public class ModulesController : ApiController
{
    // GET api/values
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    // GET api/values/5
    public string Get(int id)
    {
        return "value";
    }
}

NOTE from the above code:

The difference between the two APIConfig files is :

For Module Code:

routeTemplate: "api/module/{controller}/{action}/{id}"

For Base Code:

routeTemplate: "api/{controller}/{action}/{id}"

Global.asax:

namespace BaseSln
{
public class Global : HttpApplication
{
    void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);

        //GlobalConfiguration.Configure(WebApiConfig.Register);

        var typesWithMyAttribute =
            from a in AppDomain.CurrentDomain.GetAssemblies()
            from t in a.GetLoadableTypes().Where(t1 => t1.Name == "WebApiConfig"
                            && t1.GetMethod("Register") != null
                            && t1.GetMethod("Register").IsStatic)
            select new { Type = t, MethodInfo = t.GetMethod("Register") };

        //register all the Routes
        foreach (var type in typesWithMyAttribute)
        {
            var mi = type.MethodInfo;
            Action<HttpConfiguration> action = null;
            try
            {
                action = Delegate.CreateDelegate(typeof(Action<HttpConfiguration>), mi) as Action<HttpConfiguration>;
            }
            catch
            {
                //ignore the errors for now... should be handled somewhere else or logged.
            }

            if (action != null) GlobalConfiguration.Configure(action);
        }
    }
}

}

What I tried with the above project:

After hosting in IIS, I tried to access the path which is something like this:

For Base API:

http://localhost:51600/api/Values/Get

Returns:

value1
value2

For Module API

http://localhost:51600/api/Modules/Get

Returns:

value1
value2

My problem:

After sometime, when I try to access the same link, I am unable to get that. It says

status 404. Not Found

I have been working on this issue for 3 days, and I couldn't resolve the problem.

I have searched many articles in stackoverflow, but no luck.

Kindly help me to get rid off from this.

Thanks.

Answer 1

如果您拥有Base Web API和Module Web API的所有路由，是否可以检查Base Solution中的GlobalConfiguration.Configuration.Routes ？