Client-Server Communication in Perl CGI

Posted by sri on November 14, 2008, 7:57 am

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Hi Friends,

I have a requirement like this,

My client program is a browser, and the server may be run in perl, ror
or any other server side scripting. The browser has to send the
request to the server once, after that the server has to keep track of
the client and send the response frequently to the client.

One way we can achieve this with Applets. Is there any other way to
achieve this ??

Regards,
Sri Seethalakshmi.B

Posted by Jim Gibson on November 14, 2008, 1:09 pm

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In article

> Hi Friends,

> I have a requirement like this,

> My client program is a browser, and the server may be run in perl, ror

> or any other server side scripting. The browser has to send the

> request to the server once, after that the server has to keep track of

> the client and send the response frequently to the client.

> One way we can achieve this with Applets. Is there any other way to

> achieve this ??

Sounds like 'AJAX' to me. I am only familiar with the concept, not the
methods, so I can't say for sure. See
<http://en.wikipedia.org/wiki/Ajax_(programming)> for more info.

For vanilla HTTP, the choice is "server push" and "client pull". See,
for example <http://oreilly.com/openbook/cgi/ch06_06.html>.

For an example of client pull, see
<http://www.stonehenge.com/merlyn/LinuxMag/col39.html>

--
Jim Gibson

Posted by Peter J. Holzer on November 15, 2008, 1:43 pm

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> In article

>> My client program is a browser, and the server may be run in perl, ror

>> or any other server side scripting. The browser has to send the

>> request to the server once, after that the server has to keep track of

>> the client and send the response frequently to the client.

>> One way we can achieve this with Applets. Is there any other way to

>> achieve this ??

> Sounds like 'AJAX' to me.

Nope. AJAX doesn't magically allow the server to send something to the
browser without a request. Instead some JavaScript running in the
browser sends requests to the browser. So, for in the terminology you
use below, it is some kind of "client pull".

> I am only familiar with the concept, not the

> methods, so I can't say for sure. See

><http://en.wikipedia.org/wiki/Ajax_(programming)> for more info.

> For vanilla HTTP, the choice is "server push" and "client pull". See,

> for example <http://oreilly.com/openbook/cgi/ch06_06.html>.

> For an example of client pull, see

><http://www.stonehenge.com/merlyn/LinuxMag/col39.html>

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