context_builder.go
func (cb *ContextBuilder) SetRoutingDelegate(rd string) *ContextBuilder {
	if cb.CallOptions == nil {
		cb.CallOptions = new(CallOptions)
	}
	cb.CallOptions.RoutingDelegate = rd
	return cb
}
func (cb *ContextBuilder) SetRoutingDelegate(rd string) *ContextBuilder {
	if cb.CallOptions == nil {
		cb.CallOptions = new(CallOptions)
	}
	cb.CallOptions.RoutingDelegate = rd
	return cb
}
// SetRoutingDelegate sets the RoutingDelegate call options ("rd" transport header).