title: swagger .net core API ambiguous HTTP method for Action Error
body: <p>Implementing Swashbuckle/Swagger with .net Core 2 API I am now receiving the 500 error when accessing swagger.json: </p>
  
  <blockquote>
    <p>NotSupportedException: Ambiguous HTTP method for action -
    EBisAPI.Controllers._class.HandleError (EBisAPI). Actions require an
    explicit HttpMethod binding for Swagger</p>
  </blockquote>
  
  <p>I have gone through all the controllers and see explicit routing on all the public methods of each controller. Is there a way to determine which method is throwing the ambiguous routing error? </p>