ASP. NET Web Api 2 issue - The requested resource does not support HTTP method 'GET'

Question

I am not sure why I am getting a "404 Not Found" on the following GET call to my api (using PostMan)

http://localhost:53840/api/v1/MessageLog/SomeStuff/3

The method in the Controller is as follows

    [System.Web.Http.HttpGet]
    public string SomeStuff(int s)
    {            
        return "Received input !";            
    }

The Register method in the WebApiConfig class has the only route as follows :

         config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/v1/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

But when I change the code to

    [System.Web.Http.HttpGet]
    public string SomeStuff()
    {            
        return "Received input !";            
    }

The call http://localhost:53840/api/v1/LogMessage/SomeStuff works and POSTMAN displays the "Recieved input !" string in the response body.

Is there a specific calling convention for passing in int/string etc. (I tried using a [FromUri] without much success) ? I have another POST method in the controlled which takes a JObject and that seems to be working perfectly fine.

juunas · Accepted Answer · 2017-02-14 19:12:36Z

1

It should be something like:

[System.Web.Http.HttpGet]
public string SomeStuff(int id)
{            
    return "Received input !";            
}

Web API matches the parameter by name. In your route template, it is defined as {id} so the action parameter name must match that.

The reason the second one works is because the id is optional and the action matches the template.

answered Feb 14, 2017 at 19:12

juunas

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