Two-way Communication over HTTP

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Browsers can receive simulated server-to-client invocations by opening multiple HTTP connections and using the following mechanisms:

  • XMLHttpRequest
  • <iframe>s and long polling

The problem with this approach is that the server is forced a number of underlying TCP connections for each client: one for sending information and a new one for each incoming message. The Wie protocol has a high overhead, each message has a HTTP header.

Obsoleted by WebSockets.