The route template separator character '/' cannot appear consecutively - Attribute routing issue

Question

The configuration has nothing to do with the error

This is my configuration for the Web API in App_Start/WebApiConfig.cs:

public static void Register(H         


        

Answer 1

I got the same error however it was caused by the ActionName attribute in my case.

[ActionName("")]
public void Get(string code)

Although this broke the Help pages I was still able to reach the endpoint api/controller?code=123. When I removed the ActionName attribute the error disappeared.