Re: [Dynapi-Help] Simple communication questions...

[Raymond I. <xw...@ya...>]

Hi,

For some more information on server-push and
client-pull visit the following website:

http://wp.netscape.com/assist/net_sites/pushpull.html

--
Raymond Irving

--- Leif W <war...@us...> wrote:
> I was thinking of how to approach this problem a
> while back (for the case of
> a simple online cardgame) but never came to anything
> concrete.  However, I
> did remember playing with some script (it was in
> Perl but you could use any
> language) which acts as a server-push, but it only
> works for Mozilla, not
> IE, and not tested in Opera or Safari.  So, if you
> want a true client-server
> model with bidirectional communication I guess
> you're best off coding a Java
> applet for the browser, and whatever language
> specialized server with your
> own protocol.
> 
> Anyways here's the example code I was using.  Also,
> I was testing on an
> Apache server and the script would not work unless
> the filename began with
> "nph-" which stands for non-parsed headers.
> 
> =============================
> BEGIN - Perl script
> =============================
> #! /usr/bin/perl -w
> use strict;
> 
> use CGI qw/:standard :push/;
> use CGI::Carp 'fatalsToBrowser';
> 
> $CGI::POST_MAX = 1024 * 1024; # max 1M posts
> $CGI::DISABLE_UPLOADS = 1;  # no uploads
> $| = 1;
> 
> print multipart_init(-boundary=>'----here we go!');
> 
> foreach (0 .. 4) {
>     print multipart_start(-type=>'text/plain'),
>           "The current time is
> ",scalar(localtime),"\n";
>     if ($_ < 4) {
>             print multipart_end;
>     } else {
>             print multipart_final;
>     }
>     sleep 1;
> }
> 
> =============================
> END - Perl script
> =============================
> 
> As you can see, most of the actual server-push code
> is handled by the CGI
> Perl Module.  So just taking a quick peek inside to
> show the relevent bits
> of raw HTTP and HTML tricks used, or just using
> telnet or wget to fetch from
> the server.
> 
> Headers: (first three added by Apache, last one
> added by the script)
> 
> HTTP/1.0 200 OK
> Server: Apache/2.0.47 (Unix) mod_ssl/2.0.47
> OpenSSL/0.9.7c DAV/2
> PHP/4.3.4RC1
> Date: Tue, 14 Oct 2003 13:39:48 GMT
> Content-Type:
> multipart/x-mixed-replace;boundary="----here we go!"
> 
> Content:
> 
> WARNING: YOUR BROWSER DOESN'T SUPPORT THIS
> SERVER-PUSH TECHNOLOGY.
> ------here we go!
> Content-Type: text/plain
> 
> The current time is Tue Oct 14 09:39:48 2003
> 
> ------here we go!
> Content-Type: text/plain
> 
> The current time is Tue Oct 14 09:39:49 2003
> 
> ------here we go!
> Content-Type: text/plain
> 
> The current time is Tue Oct 14 09:39:50 2003
> 
> ------here we go!
> Content-Type: text/plain
> 
> The current time is Tue Oct 14 09:39:51 2003
> 
> ------here we go!
> Content-Type: text/plain
> 
> The current time is Tue Oct 14 09:39:52 2003
> 
> ------here we go!--
> WARNING: YOUR BROWSER DOESN'T SUPPORT THIS
> SERVER-PUSH TECHNOLOGY.
> 
> 
> 
> ----- Original Message ----- 
> From: "Raymond Irving" <xw...@ya...>
> To: <dyn...@li...>
> Sent: Monday, October 13, 2003 10:27 AM
> Subject: Re: [Dynapi-Help] Simple communication
> questions...
> 
> 
> >
> > See below:
> >
> > --- Clemens Eisserer <Lin...@we...> wrote:
> > > Hi again!
> > >
> > > I´m currently thinking about writing a simple
> > > JS-Chat, so that the chat doent need to reload
> > > always when
> > > new messages recieve.
> > > The problem is, that the server should connect
> to
> > > the client, which is not possible as far as I
> know,
> > > this
> > > means the client has to use possling and aks all
> x
> > > seconds the server for new messages.
> > >
> > > 1.) Is there no other was to do this than
> polling?
> >
> > Not that I know of
> >
> > > 2.) These are the only polling-ideas I had:
> > > * Blocking soda-rpc function. Blocks till
> messages
> > > are on server. (Problem with blocking - no
> events
> > > etc?)
> > > * Non-Blocking soda-rpc function. Returns -1 if
> > > nothing is there...
> > >
> > > Is the blocking version possible, or will it
> cause
> > > the application to hand in the poll-loop. This
> is a
> > > problem
> > > in my eyes since JS hasnt support für
> Multithreading
> > > :(
> >
> > Using synchronous GET or post will cause the app
> to
> > wait until the server returns a response.
> >
> >
> > > Does anybody have better ideas, I´m not really
> happy
> > > with my stuff..
> >
> > In the future there might be an easier method
> >
> > --
> > Raymond Irving
> >
> > > lg Clemens
> > >
> > > PS1: How hard would it be to adopt dynapi to
> > > knoqueror? (only because it interrests me why so
> > > many
> > > examples dont work..)
> > > PS2: Dynapi is great!
> > >
> > >
> >
>
____________________________________________________________________________
> __
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> > > und WEB.DE Club bei Stiftung Warentest!
> > > http://f.web.de/?mc=021183
> > >
> > >
> > >
> > >
> >
>
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=== message truncated ===


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