String route binding still has URI escape sequences

[flipchart]

With a controller as below:

[Route("api")]
public class ValuesController : Controller
{
    [HttpGet("{param}")]
    public string Get(string param)
    {
        return param;
    }
}

requests to this action which contain URI escape sequences (e.g. %20 for space) are carried through in the param value, rather than being escaped as they were in ASP.net 4; i.e. GET /api/a%20b assigns param the value "a%20b" instead of "a b"

[rynowak]

This is very likely a manifestation of this kestrel bug: aspnet/KestrelHttpServer#124