405 method not allowed Web API

Question

This error is very common, and I tried all of the solutions and non of them worked. I have disabled WebDAV publishing in control panel and added this to my web config file:<

Answer 1

You can also get the 405 error if say your method is expecting a parameter and you are not passing it.

This does NOT work ( 405 error)

HTML View/Javascript

$.ajax({
         url: '/api/News',
         //.....

Web Api:

public HttpResponseMessage GetNews(int id)

Thus if the method signature is like the above then you must do:

HTML View/Javascript

$.ajax({
         url: '/api/News/5',
         //.....

Answer 2

If you have a route like

[Route("nuclearreactors/{reactorId}")]

You need to use the exact same parameter name in the method e.g.

public ReactorModel GetReactor(reactorId)
{
 ...
}

If you do not pass the exact same parameter you may get the error "405 method not allowed" because the route will not match the request and WebApi will hit a different controller method with different allowed HTTP method.

Answer 3

This does not answer your specific question, but when I had the same problem I ended up here and I figured that more people might do the same.

The problem I had was that I had indeliberately declared my Get method as static. I missed this an entire forenoon, and it caused no warnings from attributes or similar.

Incorrect:

public class EchoController : ApiController
{
    public static string Get()
    {
        return string.Empty;
    }
}

Correct:

public class EchoController : ApiController
{
    public string Get()
    {
        return string.Empty;
    }
}

Answer 4

This error can also occur when you try to connect to http while the server is on https.

It was a bit confusing because my get-requests were OK, the problem was only present with post-requests.

Answer 5

I was getting the 405 on my GET call, and the problem turned out that I named the parameter in the GET server-side method Get(int formId), and I needed to change the route, or rename it Get(int id).

Answer 6

Here is one solution

<handlers accessPolicy="Read, Script"> <remove name="WebDAV" /> </handlers>

docs.microsoft.com solution article

and remove WebDAV from modules

<remove name="WebDAVModule" />