Polling is nothing but a periodic checking from client (browser) to the server.
For example, BOSH is a popular, long-lived HTTP technique used as a long-polling alternative to a continuous TCP connection when such a connection is difficult or impossible to employ directly (e.g., in a web browser); it is also an underlying technology in the XMPP, which Apple uses for its iCloud push support.
Consuming message using long polling. As the XMPP/Websocket draft stabilizes, we’ll see that support for Websocket too (Prosody already supports Websocket). Long polling does not create a persistent connection, but instead polls the server with a request that stays open until the server responds, at which point the connection closes, and a new connection is requested immediately. Long polling utilizes regular HTTP requests. If there is no information empty response will be send to the client. Long Polling; SignalR automatically chooses the best transport method that is within the capabilities of the server and client. Long polling is a lot more intensive on the server, but more widely accepted for browsers. The maximum long polling wait time is 20 seconds. The server responds immediately with available data.
The absense of a long-lived connection requires the server to consider client traffic as a heartbeat to keep the session alive. A typical server (like open-source Prosody, or commercial Isode M-Link), ships with support for BOSH.
Long polling.
SignalR uses hubs to communicate between clients and servers. Extensible Messaging and Presence Protocol (XMPP) is a communication protocol for message-oriented middleware based on XML (Extensible Markup Language). In this video we will go through the difference between HTTP short polling, long polling and WebSockets.
Before there were Server-Sent Events people usually resorted to long polling to receive “real-time” data from the server.
Websockets are extremely lightweight on the server, but not … XMPP is designed to be extensible, and many extensions have very broad deployment. Zero or more XMPP packets may be sent in a single request or reply, including partial XMPP packets. Hubs. "It's a feature, not a bug" is the obvious thing to say here. We will then look at Socket.IO and see how is it related to short polling, long polling … HTML5 WebSocket: A Quantum Leap in Scalability for the Web By Peter Lubbers & Frank Greco, Kaazing Corporation (This article has also been translated into Bulgarian.). There’s also more web-like gateway libraries such as xmpp-ftw. It enables the near-real-time exchange of structured yet extensible data between any two or more network entities. Ajax long polling. In the early days of the realtime web, long-polling was used mostly as an underlying hack in the emulation of streams. This may introduce some latency while the connection resets.
For XMPP in a long polling session, there’s BOSH.
When the wait time for the ReceiveMessage API action is greater than 0, long polling is in effect. XMPP's core, RFC 6120, doesn't even include the "classic" IM features, really; those are present in its companion specification, RFC 6121.
It enables the near-real-time exchange of structured yet extensible data between any two or more network entities. Long-polling delivers live updates as fast as any other TCP-based mechanism, such as XMPP or WebSockets.
Don’t let the word “poll” in there throw you off. open-source library that simplifies adding real-time web functionality to apps Lately there has been a lot of buzz around HTML5 Web Sockets, which defines a full-duplex communication channel that operates through a single socket over the Web. A hub is a high-level pipeline that allows a client and server to call methods on each other. Extensible Messaging and Presence Protocol (XMPP) is a communication protocol for message-oriented middleware based on XML (Extensible Markup Language). XEP-0025: Jabber HTTP Polling. Long-polling gets a bad rap.
Long polling helps reduce the cost of using Amazon SQS by eliminating the number of empty responses (when there are no messages available for a ReceiveMessage request) and false empty responses … Not to give the wrong impression, long polling is still used today in some scenarios. I was active in the XMPP community back when BOSH was being developed, and indeed we looked at it as a giant hack. HTTP long-polling.
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