Simple "Long Polling" example code?

Posted by dbr on Stack Overflow See other posts from Stack Overflow or by dbr
Published on 2008-12-02T11:14:47Z Indexed on 2010/06/12 4:22 UTC
Read the original article Hit count: 542

Filed under:

http

|

comet

I can find lots of information on how Long Polling works (For example, this, and this), but no simple examples of how to implement this in code.

All I can find is cometd, which relies on the Dojo JS framework, and a fairly complex server system..

Basically, how would I use Apache to serve the requests, and how would I write a simple script (say, in PHP) which would "long-poll" the server for new messages?

The example doesn't have to be scaleable, secure or complete, it just needs to work!

© Stack Overflow or respective owner

Related posts about http

Cannot update, apt-get cannot fetch index files

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have a fresh install of Ubuntu 11.10 from the iso 'ubuntu-11.10-desktop-amd64.iso'. I installed this in VMWare Fusion 4.1.1 running on OSX 10.7.3. When setting up the VM, I allowed easy install to take care of creating my user and installing VMWare tools. No problems during installation, everything… >>> More
the size of apt-get update lists is too big

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I ran a clean install to Ubuntu 12.04 and so far everything has been working well. I especially commend the Ubuntu team for this release. I only noticed that the size of repository update is now about ~13MB. Normally, it is about this size for the first time you run apt-get update after a clean install… >>> More
Quantal: Broken apt-index, cant fix dependencies

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I can't seem to add/remove/update packages Ubuntu software update has a notice about partial upgrades but fails Seems to be similar to this problem $ sudo apt-get update Ign http://archive.ubuntu.com quantal InRelease Ign http://security.ubuntu.com precise-security InRelease Ign… >>> More
12.04: Apt-Get Update: failure to fetch; can't connect to any sources

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I realize there are dozens of "apt-get update: failure to fetch" questions (I read through all I could find), but my present circumstance is unique to 12.04 and it affects all sources; not just launchpad. Additionally, I've tried several different servers in Europe and the U.S. as well as the "main… >>> More
How can I remove the Translation entries in apt?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
This is the output of aptitude update: Ign http://archive.canonical.com natty InRelease Ign http://extras.ubuntu.com natty InRelease Ign http://dl.google.com stable InRelease Ign http://security.ubuntu.com natty-security InRelease Hit http://deb.torproject.org natty InRelease Get:1 http://dl.google… >>> More

Related posts about comet

How to implement Comet server side with Python?

as seen on Stack Overflow - Search for 'Stack Overflow'
I once tried to implement Comet in PHP. Soon, I found that PHP is not suitable for Comet, since each HTTP request will occupy one process/thread. As a result, it doesn't scale well. I just installed mod_python in my XAMPP. I thought it would be easy to implement Comet with Python asynchronous programming… >>> More
Asynchronous COMET query with Tornado and Prototype

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello everyone. I'm trying to write simple web application using Tornado and JS Prototype library. So, the client can execute long running job on server. I wish, that this job runs Asynchronously - so that others clients could view page and do some stuff there. Here what i've got: #!/usr/bin/env/… >>> More
.NET Comet engine

as seen on Stack Overflow - Search for 'Stack Overflow'
is there a .net based comet engine? like Ajax Push Engine that is free and open source? >>> More
COMET no JS framework links/tutorials?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, Are there any sites that has a tutorial about COMET without the use of any javascript framework? I want to see the core codes of COMET and learn how it works. Thanks in advance Cheers, Mark >>> More
Need help with setting up comet code

as seen on Stack Overflow - Search for 'Stack Overflow'
Does anyone know off a way or maybe think its possible to connect Node.js with Nginx http push module to maintain a persistent connection between client and browser. I am new to comet so just don't understand the publishing etc maybe someone can help me with this. What i have set up so far is the… >>> More