code: func (client *Client) GetRouteMapping(guid string) (RouteMapping, Warnings, error) {
  	request, err := client.newHTTPRequest(requestOptions{
  		RequestName: internal.GetRouteMappingRequest,
  		URIParams:   Params{"route_mapping_guid": guid},
  	})
  	if err != nil {
  		return RouteMapping{}, nil, err
  	}
  
  	var routeMapping RouteMapping
  	response := cloudcontroller.Response{
  		DecodeJSONResponseInto: &routeMapping,
  	}
  
  	err = client.connection.Make(request, &response)
  	return routeMapping, response.Warnings, err
  }
docs: // GetRouteMapping returns a route mapping with the provided guid.