How to get RRC attribute type information using ReST api

While trying to get attribute types using the following URL
https://kovair-virsrv1.kovairindia.com:9443/rm/types/
in my local system from C# code.

getting the output as below:

<rdf:RDF
    xmlns:err="http://jazz.net/xmlns/prod/jazz/foundation/1.0/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description>
    <err:detailedMessage rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
    >getInternalRequestHandlerService(context) returned null. This error used to report 'The requested service requires a private header'. (More info found at entry [d1779eb4e3d4f195] in RRS server log)</err:detailedMessage>
    <err:errorMessage rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
    >Forbidden</err:errorMessage>
    <err:errorStatus rdf:datatype="http://www.w3.org/2001/XMLSchema#long"
    >403</err:errorStatus>
  </rdf:Description>
</rdf:RDF>

Please give me solution how to get the type information for RRC