long-polling | 易学教程

Does facebook use comet or long polling for getting new stream and messages?

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问题 I would like to know if there are any code references that I can follow to write a very simple example. Many posts or websites just talk about the technology. 回答1: Yes "it's a variation of Comet , specifically XHR long polling , and/or BOSH ." reference site: https://www.facebook.com/note.php?note_id=14218138919 来源： https://stackoverflow.com/questions/9579843/does-facebook-use-comet-or-long-polling-for-getting-new-stream-and-messages

Websockets. Loss of internet, keep-alive messages, app architecture etc

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Well, there's a lof of information about websockets. The technology itself is amazing, there's no doubt in this fact. And before i will start using them in my app i just want the community to answer these questions: "...in order to maintain presence, the app can send keep-alive messages on the WebSocket to prevent it from being closed due to an idle timeout..." "...ideally a future version of WebSocket will support timeout discovery, so it can either tell the application the period for keep-alive messages..." This feels like deja vu. Earlier we had to poll the server once a %period_time% to

Long polling in Django

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问题 I'm using a sort of long polling in my Django app to return status messages about a long operation to the client as it progresses. I do this by returning an HttpResponse object in my view function that is initialized with an iterator that returns strings. This all works great, but the iterator function is getting pretty long with tons of yields to return the status messages. I'd like to architect this better by splitting the long operation into multiple functions, each of which returns its

What is the difference between web sockets, long polling, server-sent events and forever frame?

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问题 I'm currently exploring SignalR, this technology supports transports (web wockets, long polling ,server-sent events and forever frame). I have understood the terminology web sockets and long polling. But what is Server-Sent Events and Forever Frame? How all four differ from each other? 回答1: Transports and fallbacks of SignalR: WebSocket Full-duplex Websocket is a full-duplex communication channels over a single TCP connection. When both server and browser support, it is the only transport

Is this a true long polling?

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After lot of trials,I am successfully able to maintain continous server connection with database. Now code keet cheking and show the messages,if there are new in database. Plz review and tell if there is true long polling technique used in this code? If it is not,then plz suggest,where I am wrong(deviating from long polling) and how this can be made a true long polling. Currenlty,I am getting these errors.However still it maintains the continous connection with database. each time,Only one message is pulled instead of all. (I used .each loop but it stops the long polling) After every 10/15

Long-polling vs Apple Push Notification Service & Android C2DM [closed]

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问题 I am building a mobile application that has some realtime constraints. Therefore I turn to stackoverflow to get advices & opinions and attempt to decide which is the best solution to update the state of the application while running: rely on long-polling or direct connection to my server rely on Apple Push Notification Service and Android C2DM Beyond the fact that APNS and C2DM provide a unified interface to push notification while the application is running or not, one can say that a custom

Apache with Comet Support

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I'd like to build a multiplayer web game application in which it supports chat. I presume the application will have to handle hundreds of simultaneous connections. I'm planning to host my application in a shared web hosting, which has these limitations (most likely similar to PHP + Comet (long-polling) scaling / hosts ): It does not seem I can change the web server. Most likely it's using Apache. Supports MySQL 5, PHP 5.3.x, Perl, Python, Ruby on Rails, CGI (To be more precise, I'll be using HawkHost's shared web hosting.) And here are my result of research, followed by my questions: Some

Long Polling using jQuery and PHP

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问题 So, I've been trying to do Long-Polling using the jQuery Library and PHP. I'm doing this so I can make some sort of real-time notifications system in the future. The code I have now isn't really working. index.php <html> <head> <title>Long Polling</title> <script type='text/javascript' src='http://code.jquery.com/jquery-1.6.2.min.js'></script> <script type='text/javascript'> $(document).ready(function() { getData(); }); function getData() { $.ajax({ type: "POST", url: "ajax.php", async: true,

Ajax Long Polling

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I recently asked a question on StackOverflow about a function of mine and people recommended that I use Ajax Long Polling. I have spent the past couple of days researching the subject and have tried to write basic long polling code, but none of it has worked and I can not get anything I do to work at all. Here is my basic function: <script language='javascript' type='text/javascript'> var interval=self.setInterval("checkformessages()",4000) function checkformessages() { $('#incomingmessages<?php echo $otherchatuser ?>').load('checkfornewmessages.php?username=<?php echo $username; ?>

Is long polling possible in Google App Engine?

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问题 I need to make application that needs to poll server often, but GAE has limitations on requests, so making a lot of requests could be very costly. Is it possible to use long polling and make requests wait for the maxium 30 seconds for changes? 回答1: Google AppEngine has a new feature Channel API, with that you have a possibility to build a good realtime application. Another solution is to use a third part comet server like mochiweb or twisted with a iframe pattern. Client1, waiting a event: