the answer is they all get separated by slashes as shown below
<HttpGet()> _
<Route("getsinglerangeprojection/symboltype/{symboltype:int}/symbol/{symbol}/requestdate/{requestDate:datetime}")> _
Public Function GetSingleRangeProjection(ByVal symboltype As Integer,
ByVal symbol As String,
ByVal requestDate As String) As ProjectedRange
...code here
End Function