intermediatetermWeb foundationsWeb foundations / Long Polling
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Long Polling

A web application development pattern where the client requests data from the server, and the server holds the request open until new data is available.

Definition

A web application development pattern where the client requests data from the server, and the server holds the request open until new data is available.

Use case

Simulating real-time notifications in legacy browsers when full WebSocket support is unavailable.

Related terms

Articles

Long polling

JavaScript.info · Article · link checked 2026-10-16

Faking real time with held-open requests, and when it is enough.

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