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Re: chat on web, Ajax ? [message #177171 is a reply to message #177161] Fri, 24 February 2012 16:31 Go to previous messageGo to previous message
SL is currently offline  SL
Messages: 20
Registered: February 2012
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Junior Member
> That is the problem: typical http requests data from some server, and
> after it arrives, that's it.
> A normal http request:
> 1) Browser sends request to server.
> 2) server answers
> the end.
> How to let the browser listen to the server?
>
> Short answer: You cannot. Not without some tricks or additional
> software (Java, Flash for example).
>
> Read up here first:
> http://en.wikipedia.org/wiki/Push_technology#HTTP_server_push
>
> You can see on that page that a few experiments have been tried, but
> none of them if fully reliable.
> For example: multipart/x-mixed-replace is not supported by IE, and I
> don't know about mobile devices.
>
> You have 2 options:
> 1) Make a client-pull approach, eg with XHR ("Ajax").
> http://en.wikipedia.org/wiki/XMLHttpRequest
> Advantage: Easy to implement.
> Drawback: All the connected clients will be sending update-requests
> all the time. This will lead to extra serverload which can kill the
> server if you have many clients trying to chat.
>
> 2) Use additional software that CAN listen.
> Problem: See former thread: Suppose your server wants to PUSH new data
> to some client: How to deliver that behind a firewall/NAT? To which
> port?
.....
.....

Yahoo has a messenger that is implemented on web; one can see it after
logging in to check mail.

With such serious shortcomings, I suppose they have to have a larger server
farm to take care of the load from chatting.

:-) :-)
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