ASP.NET route to mvc or api by subdomain

Question

Our application have 2 domains (www | api).mydomain.com

How can I route requests to api.mydomain.com to api controllers and www to mvc controllers?

Thank you

Answer 1

I solved my problem using constraints.

This site gave me the clue: http://stephenwalther.com/archive/2008/08/07/asp-net-mvc-tip-30-create-custom-route-constraints.aspx

And here is my implementation:

public class SubdomainRouteConstraint : IRouteConstraint
{
    private readonly string _subdomain;

    public SubdomainRouteConstraint(string subdomain)
    {
        _subdomain = subdomain;
    }

    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        return httpContext.Request.Url != null && httpContext.Request.Url.Host.StartsWith(_subdomain);
    }
}

And my routes:

    public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
#if !DEBUG
                ,constraints: new { subdomain = new SubdomainRouteConstraint("www") }
#endif
            );
        }


        public static void Register(HttpConfiguration config)
        {
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
#if DEBUG
                routeTemplate: "api/{controller}/{id}",
#else
                routeTemplate: "{controller}/{id}",
#endif
                defaults: new {id = RouteParameter.Optional}
#if !DEBUG
                , constraints: new {subdomain = new SubdomainRouteConstraint("api")}
#endif
                );
}