code: @Override
  	public void filter(final ClientRequestContext requestContext) {
  		if (!backend.isEmpty() && backend.getConfiguration().shouldProcessContext(OutgoingRequest)) {
  			final Map<String, String> filtered = backend.getConfiguration().filterDeniedParams(backend.copyToMap(), OutgoingRequest);
  			requestContext.getHeaders().putSingle(TraceeConstants.TPIC_HEADER, transportSerialization.render(filtered));
  		}
  	}
docs: This method handles the outgoing request