Accept any HTTP method/verb in ASP.NET WebAPI

Question

I have an action on an ApiController in an ASP.NET project.

I want it to accept any HTTP method (even bogus ones, if possible).

I can't find a Don't filter by method attribute though. Do I have to create one?

Adding multiple attributes works fine for the standard methods. Can I catch everything though?

NB This is a Framework 4.72 application, not a Core application

Answer 1

You cannot ignore filtering by HTTP method completely in Web API , the framework seems to be pretty strict in this matter. But you can specify predefined set of any method names you need (even bogus ones) using AcceptVerbs attribute

[AcceptVerbs("POST", "GET", "MyMethod", "Bo-Gus")]
public IHttpActionResult MyAction()

Or you can implement IActionHttpMethodProvider that returns allowed methods

[AttributeUsage(AttributeTargets.Method)]
public class AllowBogusMethodsAttribute : Attribute, IActionHttpMethodProvider
{
    public Collection<HttpMethod> HttpMethods
    {
        get
        {
            return new Collection<HttpMethod>
            {

                HttpMethod.Get,
                HttpMethod.Post,
                new HttpMethod("MyMethod"),
                new HttpMethod("Bo-Gus")
            };

        }
    }
}

and use it like this

[AllowBogusMethods]
public IHttpActionResult MyAction()

Note

HttpMethods getter will be called only once during application lifetime and its result will be cached, and therefore you cannot add new allowed HTTP methods during requests and return updated collection.

Answer 2

If you do not apply any action verb, then that action will be treated as GET request action. That is the default behavior.

I never tried with adding HttpGet, HttpPost , Put etc. to the same action.

Alternative approach would be to have individual actions for different http verbs and then redirect to one action with parameters.