400 Bad Request when trying Ajax call to Controller in ASP.NET MVC

Question

So I've been struggling to do a simple request from a CSHTML page to a Controller in my ASP.NET MVC website application. I'm using Ajax to try a DELETE call:

$.ajax({
    url: "/company/delete",
    type: "DELETE",
    success: function (e) {
        showAlert('Success!');
    }
});

And just returning a JSON on the controller side:

public class CompanyController : BaseController
{
    protected readonly IHttpClientFactory _clientFactory;

    public CompanyController(IHttpClientFactory clientFactory)
    {
        _clientFactory = clientFactory;
    }

    [HttpDelete]
    [Route("company/delete")]
    public JsonResult DeleteCompany()
    {
        return Json("ok");
    }
}

BaseController.cs :

[Authorize(Policy = "IsLoggedIn")]
public class BaseController : Controller
{ }

Every other implementation I saw was something like this. I've tried using @Url.Action("DeleteCompany", "Company") as Ajax URL, removing route and requesting to /Company/DeleteSite , adding [AllowAnonymous] tag as I'm using authentication, nothing works. It will always return a 400 Bad Request error (at least it is not 404 ).

I didn't start the project, so I don't know if there is any other configurations to set and access the Controller from the View. Note that I can access my API from the Ajax and access the API from the Controller, but I'm not being successful with accessing the Controller from the View with Ajax.

Answer 1

It turns out it was bad IIS configuration. Adding a rule to accept every type of request worked.

This is the handler in web.config :

<add name="aspNetCore" path="*" verb="GET,HEAD,POST,DEBUG,DELETE,PUT" modules="AspNetCoreModuleV2" resourceType="Unspecified" requireAccess="None" />

Answer 2

Change your controller function return type to ActionResult instead of JsonResult

[HttpDelete]
[Route("company/delete")]
public ActionResult DeleteCompany()
{
    return Json("ok");
}