router->http_get(R"(/port/:id/latest)",
  [](auto req, auto params) {
    auto resp = req->create_response();
    resp.append_header_date_field()
        .append_header(restinio::http_field::content_type, "application/json");
    restinio::transforms::zlib::gzip_body_appender(resp)
        .append(load_port_data(params["id"]))
        .complete();
    return resp.done();
  });

router->http_post(R"(/port/:id/data)",
  [](auto req, auto params) {
    return restinio::transforms::zlib::handle_body(*req, [&](auto uncompressed_body) {
        store_port_data(params["id"], upcompressed_body);
        return req->create_response()
            ...
            .done();
      });
  });

const auto count = qp.has( "count" ) ? restinio::cast_to<unsigned>( qp[ "count" ] ) : 100u;

const auto count = restinio::value_or(qp, "count", 100u ) );