Using path segment in RequestHeader transform not working

[RGFuaWVs]

Description

Using the same configuration syntax as for QueryRouteParameter, it is not possible to set a path segment as value using the RequestHeader transform. Is this behaviour intended or is it a bug?

To Reproduce

Configuration:

  "Routes": {
    "route1": {
      "ClusterId": "cluster1",
      "Match": {
        "Path": "/api/{plugin}/{**remainder}"
      },
      "Transforms": [
        {
          "QueryRouteParameter": "q",
          "Append": "plugin"
        },
        {
          "RequestHeader": "header1",
          "Set": "plugin"
        }
      ]
    }
  }

GET <domain>/api/foo/bar returns

{
    "method": "GET",
    "path": "/api/foo/bar",
    "query": {
        "q": "foo"
    },
    "headers": {
        "header1": "plugin"
    }
}

Expected Behaviour

GET <domain>/api/foo/bar returns

{
    "method": "GET",
    "path": "/api/foo/bar",
    "query": {
        "q": "foo"
    },
    "headers": {
        "header1": "foo"
    }
}