useEffect(() => {

      // Load all experiments and variants
      gb.loadFeatures({ autoRefresh: true, timeout: 2000 })

      // Set user attributes for targeting (from cookie, auth system, etc.)
      gb.setAttributes({
        id: client_id, 
        url: window.location.href
      });

      if (expConfig.running) {

        //load configured experiment
        const exp = gb.run(expConfig);

        if (exp.value === expConfig.variations[0]) { //always a control
          dispatch(bootOptimize( {enableExperiment: false }));
          console.log(`exp variant - ${expConfig.variations[0]}`);
        }
        if (exp.value === expConfig.variations[1]) {
          dispatch(bootOptimize( {enableExperiment: true }));
          console.log(`exp variant - ${expConfig.variations[1]}`);
        }

      }

  }, [])