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here is how I have routing setup.

 routes.MapHttpRoute(
                        name: "Authors",
                        routeTemplate: "api/authors",
                        defaults: new { controller = "authors" }
                    );

controller action method

// GET /api/authors/
    public string GetAuthors(string author_ids)
    {
        return data;
    }

Url http://site.com/api/authors?author_ids=1 actually calls controller action but when I don't pass querystring parameter, it says no controller action matching found.

How to handle optional querystring parameter when defining route?

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1 Answer

up vote 0 down vote 
// GET /api/authors/
    public IEnumerable<string> GetAuthors()
    {
        return data;
    }

You will need to define an action that takes no parameters.

It would be better, however, to add id to your route as optional:

routes.MapHttpRoute(
                        name: "Authors",
                        routeTemplate: "api/{controller}/{id}",
                        defaults: new { id = RouteParameter.Optional }
                    );
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