Would you like to know a simple solution for refreshing a specific area of your website using ajax? Instead of having JavaScript constantly checking for changes on the server, is there a way for the server to send data when a certain event occurs?
Imagine if the client didn't have to continuously send requests, but instead, the server would only push information to the client and the client would have an event listener in place.
Looking forward to your thoughts!
Absolutely, this is possible! It's commonly known as "push" or "push streaming".
One website that provides this capability is: InstantPush. Here is a snippet from their homepage:
"InstantPush enables web pages and mobile phones to stay updated in real-time when changes occur on the server side. No need for client-side modules!"
"Since 2001, InstantPush has been ahead of the game, even predating the invention of Ajax. They are considered the pioneer in Ajax Push technology."
"Leading the market in northern Europe, InstantPush offers cutting-edge solutions for live updates."
Another company specializing in this technology is: LightStreamer. A quote from their website reads:
"Lightstreamer is a reliable Server for delivering live data to Rich Internet Applications."
"Leveraging Comet and Real-Time Web concepts, Lightstreamer efficiently streams real-time data to various types of applications including HTML, AJAX, Flex, Java, and more."
"With proven success in mission-critical systems, Lightstreamer stands out for its scalability, low network impact, and other advanced features."
The process is unable to be completed as the fundamental mechanism of the HTTP protocol involves sending a request and awaiting a response from the server, which means that the server cannot provide a response without first receiving a request.
It is not possible to achieve this. The primary function of a server is to provide requested information, which it must already have in order to do so.
It is not feasible to achieve this with conventional HTTP methods. Alternatively, you can implement long polling or a similar technique to mimic push functionality.
Websockets seem like the best choice, although they are not universally supported by all browsers at this time.
I found them to be user-friendly when using Ruby and Chrome together.
It can be quite challenging for a server to broadcast data to clients without being requested, especially considering that HTTP is stateless. Even if a browser is a registered client, it still needs to actively request the data through either code or techniques like meta refresh. Some relatively new but somewhat unstable options include Comet and websockets.
The preferred solution here would be Comet over websockets. It is indeed possible to achieve this functionality using Comet. Alternatively, utilizing a Browser plugin might also provide a workaround.
This information was extracted from a section on Push Technology in Wikipedia.
* Apple Push Notification Service
* BOSH
* Comet
* Client–server model
* File transfer
* Pull technology
* Push Access Protocol
* Push e-mail
* Reverse Ajax
* Streaming media
* WebSockets
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