Default for catchall segment doesn't work

[Daniel15]

[Route("Foo/{*path}")]
public ActionResult Foo(string path = "default")
{
    if (path == null)
    {
        return Content("NULL");
    }
    if (string.IsNullOrEmpty(path))
    {
        return Content("EMPTY");
    }
    return Content("Path: " + path);
}

If you hit /Foo/ on ASP.NET MVC 5, it outputs "Path: default". However, ASP.NET 5 + MVC 6 outputs "NULL". Hitting /Foo/Bar correctly displays "Path: Bar" on both versions. This is the same if you change the default to an empty string - ASP.NET MVC 5 returns "EMPTY" whereas MVC 6 returns "NULL".

I also tried [Route("Foo/{*path=default}")] which did not work either.

Wasn't sure whether to report this in the Routing repo or here; I've reported it here since I think catchall segments are an MVC thing (and also RouteAttribute is an MVC thing)

[Eilon]

Certainly seems like a bug...

[rynowak]

I'm wondering if the route value provider is missing a null-or-empty check. My understanding is that a catch-all segment will always have a value, even if it's the empty string.