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Using the standard route: config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); With these actions: public class ValuesController : ApiController { // GET api/values public string GetAll() { return "all"; } // GET api/values/5 public string GetById(int id) { return "single"; } // GET api/values?ids=1&ids=2 public string GetByIds([FromUri] int[] ids) { return "multiple"; } And make a request to /api/values , I get this exception: Multiple actions were found that match the request: System.String GetAll() on type MvcApplication4.Controllers.ValuesController System.String GetByIds(Int32[]) on type MvcApplication4.Controllers.ValuesController I've been spinning my wheels trying to find a solution around this. It's my belief that the GetAll and GetByIds actions are considered Multiple here, but they aren't because the GetByIds has a different signature. Is there a work around for this that doesn't involve adding {action} to the route?

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