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app.get('/', function(req, res, next) {
const isEnabled = req.optimizely.client.isFeatureEnabled(
'hello_world', // Feature key connecting feature to UI
'user123', // String ID used for random percentage-based rollout
customerId: 123, // Attributes used for targeted audience-based rollout
isVip: true,
res.send('Optimizely Express Example: ' + (isEnabled ? 'You got the hello world feature!' : 'Feature off.'))
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