Add long-poll example for subscription(node.js) about blpapi-http HOT 3 CLOSED

When writing examples, is it best practice try not to use 3rd party libraries or it is fine? It would be much harder to write a long-polling example without request, lodash and promise.

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As a principle, we should definitely be mindful of making it easy for people to run the examples with minimal extra software installed. At most we should only use things we're otherwise using in the project, but as much as possible we should even consider using less. In the cases you mention I think it's fine if needed.

I think in the case of node.js examples, anything that's easily npm installed is fine imo. For now, I think you can write the examples the way you'd like initially, and during review we'll consider if we can reduce the dependencies. Make sense?

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Closed.

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