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What is HTTP Long-Polling vs an HTTP Request?

Solved1.72K views6th August 2020driver HTTP integrations long polling
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Ben Vandenberghe [SLC] [DevOps Enabler]9.06K 6th August 2020 0 Comments

What is HTTP Long-Polling vs an HTTP Request?  When would one or the other be preferred?

Ben Vandenberghe [SLC] [DevOps Enabler] Selected answer as best 6th August 2020

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Jochen Dewachter [SLC] [DevOps Advocate]2.16K Posted 6th August 2020 2 Comments

When a regular HTTP request is sent to an API, the client expects a reply immediately from the server.

In case of long polling, the server will not immediately send a response, it'll only send a response when an event occurs on server side (e.g. a value changes). So the client sends a requests and waits until a value changes on server side before receiving a response. After receiving a response, it can again send a request and wait again for a new update.

This can be beneficial to limit the number of requests a client needs to send to see if there's an update (while there's maybe none).

Ben Vandenberghe [SLC] [DevOps Enabler] Posted new comment 6th August 2020
Wim Bruynooghe [SLC] [DevOps Advocate] commented 6th August 2020

With long-polling the client gets the response back as soon as it is available, while with a normal http-request it has to do some polling (for example every minute) to get that same response (so it could for example take a minute longer till the client has the response).
Disadvantage of long-polling is that this takes up more server-resources (the connection stays open a long time for a single request), so this is not scalable for larger applications with multiple users. A better alternative is a websocket, where the client also immediately receives the response when it is available, while the same websocket connection can handle multiple requests.

Ben Vandenberghe [SLC] [DevOps Enabler] commented 6th August 2020

Great! Thank you for those insights.

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