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 <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, October 13, 2003 10:27 AM > Subject: Re: [Dynapi-Help] Simple communication > questions... > > > > > > See below: > > > > --- Clemens Eisserer <[EMAIL PROTECTED]> 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 f�r > 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! > > > > > > > > > ____________________________________________________________________________ > __ > > > Zwei Mal Platz 1 mit dem jeweils besten > > > Testergebnis! WEB.DE FreeMail > > > und WEB.DE Club bei Stiftung Warentest! > > > http://f.web.de/?mc=021183 > > > > > > > > > > > > > > > ------------------------------------------------------- > > > This SF.net email is sponsored by: SF.net > Giveback > > > Program. > > > SourceForge.net hosts over 70,000 Open Source > > > Projects. > > > See the people who have HELPED US provide better > > > services: > > > Click here: > http://sourceforge.net/supporters.php > === message truncated === __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. 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