ASP.NET MVC Delete Action not firing

Question

I have an ASP.NET MVC 5 controller using attribute routes that doesn't appear to be working with DELETE operations.

 [Route("deletealbum/{id}")]
 [AcceptVerbs(HttpVerbs.Delete)]
 public ActionResult DeleteAlbum(int id)
 {
     // rest of the code omitted here
     return Json(true, JsonRequestBehavior.AllowGet);
 }

I explicitly changed the route name to deletename to rule out other route overload conflicts.

The above action does not fire - I get a 404 not found from IIS. However, if I switch the above action to a HttpVerbs.Get the route is found no problem.

First time in a long time building an API with MVC instead of Web API, and I can't figure out why the route is not firing - it almost looks like any DELETE operations are blocked. I see the same behavior in a different controller - GET works fine, but DELETE operation returns a 404. Is there some configuration setting that needs to be flipped to enable additional verbs perhaps?

Answer 1

This could be due to an IIS configuration issue as outlined in more detail in this answer to a similar question

You may need to enable DELETE (and PUT if you need it) in your IIS config something like this:

Before:

<add name="ExtensionlessUrl-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

After:

<add name="ExtensionlessUrl-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />