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

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.

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