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Difference Between Long-Polling, WebSockets, and Server-Sent Events

Long-Polling, WebSockets, and Server-Sent Events all solve the same problem: getting updates from the server to the client without refreshing the page. They just solve it in three different ways. Here is each one in a single sentence:

  • Long-Polling: the client asks, and the server holds the request open until it has data to send. After every answer, the client asks again.

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heybenross

· 3 years ago

When should each be used? What are the pros and cons of each?

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dominikcubic

· 2 years ago

In this description of AJAX polling, is the "requested webpage" the same as the "Client"?

  1. Client requests data from a server using regular HTTP.
  2. The requested webpage opens a connection to the server.
  3. The server sends the data to the client whenever there's new information available.
Vu Tong

Vu Tong

· 3 months ago

It's worth to mention that to avoid performance impact, the server should have some kind of asynchronous processing for incoming requests. If the server uses a traditional thread-per-request model and every client holds a long-lived connection, that will hurt the overall performance.

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