ASP.NET Web API Custom PUT Method not working (returns 404)

Question

I am trying to create a custom PUT method in my API, following the instructions at http://www.asp.net/web-api/overview/web-api-routing-and-actions/routing-in-aspnet-web-api.

My API:

public class AlarmStatusController : ApiController
{
    // Other methods here (removed for brevity)

    [HttpPut]
    public void ResetAlarmTimeout(long AlarmID)
    {
        // Do stuff (removed for brevity)
    }
}

My call to the method:

$.ajax({
    type: "PUT",
    url: "/api/AlarmStatus/ResetAlarmTimeout",
    data: { AlarmID: alarmID },
    success: AlarmResetSuccess,
    error: AjaxError
});

My API route in public static void Register(HttpConfiguration config):

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

The ajax call returns 404. If I change the API method and ajax call to a GET, then it works, but this isn't RESTful since my GET method is modifying the object.

Answer 1

Are you using VS2010? If so you're probably using Cassini, which AFAIK doesn't support PUT (see related Cassini and IISExpress PUT/DELETE Verbs cause 405 Http Code). IISExpress works well with VS2010, supports the PUT and DELETE verbs, etc. and has other advantages, so I'd consider installing that and using it.