[Bug]: Advanced REST path fails

[JerryNixon]

What?

When using an advanced REST path (a path with a slash)

"rest": {
  "enabled": true,
  "path": "/Todo/jerry" // this
},

We then could use: http://localhost:5000/api/Todo/jerry

Health

    {
      "status": "Unhealthy",
      "name": "Todo2",
      "exception": "The REST HealthEndpoint query failed with code: InternalServerError.",
      "tags": [
        "rest",
        "endpoint"
      ],
      "data": {
        "response-ms": -1,
        "threshold-ms": 1000
      }
    }

REST

{
  "error": {
    "code": "UnexpectedError",
    "message": "While processing your request the server ran into an unexpected error.",
    "status": 500
  }
}