WebUI component:

    contexts : ContextList = context_client.ListContexts(Empty())

    for context_ in contexts.contexts:

        context_uuid : str = context_.context_id.context_uuid.uuid

        #context_uuid : str = context_.context_id.context_uuid.uuid

        context_name : str = context_.name

        topologies : TopologyList = context_client.ListTopologies(context_.context_id)

        for topology_ in topologies.topologies:

            topology_uuid : str = topology_.topology_id.topology_uuid.uuid

            #topology_uuid : str = topology_.topology_id.topology_uuid.uuid

            topology_name : str = topology_.name

            raw_values = context_name, topology_name

            b64_values = [base64.b64encode(v.encode('utf-8')).decode('utf-8') for v in raw_values]

        context_topology_uuid = context_topology_form.context_topology.data

        if len(context_topology_uuid) > 0:

            b64_values = context_topology_uuid.split(',')

            LOGGER.warning('b64_values={:s}'.format(str(b64_values)))

            raw_values = [base64.b64decode(v.encode('utf-8')).decode('utf-8') for v in b64_values]

            LOGGER.warning('raw_values={:s}'.format(str(raw_values)))

            context_name, topology_name = raw_values

            #session.clear()

            session['context_topology_uuid'] = context_topology_uuid

            #session['context_name'] = context_name

            session['topology_uuid'] = topology_name

            #session['topology_name'] = topology_name

            LOGGER.warning('session.items={:s}'.format(str(session.items())))

            MSG = f'Context({context_name})/Topology({topology_name}) successfully selected.'

            flash(MSG, 'success')

            return redirect(url_for('main.home'))