This topic comes up from time to time...
Some previous information, if you get any further please post it to the list.
A while ago I saw a web page explaining a system (written in Perl I
think) that was used to show a presentation to a number of different
sites simultaneously (and synchronised). A presenter was at the main
site and the browsers at 4 other remote sites would display the same
page the presenter was viewing on his web browser as he went to various
sites. I think it worked using multipart Content-type.
Unfortunately I have lost the URL to the explanation of how it was
done.
On Saturday, 5 August 2000 8:48 AM Mr Bruce Christensen posted the following links
explaining browser push;
http://home.netscape.com/assist/net_sites/pushpull.html
and;
As for keeping the connection from timing out, see
http://www.php.net/manual/function.set-time-limit.php.
I have experimented with this but didn't get too far. I posted the following to the
PHP list but didn't get any reply.
I have tried the following script on
WinNT5, Apache/1.3.13-dev, PHP Version 4.0.1pl2
and
OpenBSD2.7 Apache/1.3.12, PHP Version 4.0.1pl2 (mod_php4)
push.php;
----------8<-------snip-----------8<------start
<?php
header("HTTP/1.0 200 OK");
header("Content-type:
multipart/x-mixed-replace;boundary=ThisRandomString");
print("\n");
print( "--ThisRandomString\n");
print("Content-type: text/html\n");
print("\n");
print( "First update at ");
echo date("H:i:s");
print("\n\n");
print( "--ThisRandomString\n");
flush();
sleep(5);
print("Content-type: text/html\n");
print("\n");
print( "Second update at ");
echo date("H:i:s");
print("\n\n");
print("--ThisRandomString--\n");
?>
----------8<-------snip-----------8<------end
On NT with the
header("HTTP/1.0 200 OK");
statement I get an Apache error message;
[Sun Aug 06 09:02:47 2000] [error] [client 192.168.0.60] malformed
header from script. Bad header=HTTP/1.0 200 OK: f:/program files
/novato/allcnet/php.exe
I do not get this error on OpenBSD.
I then removed the
header("HTTP/1.0 200 OK");
statement and now NT and OpenBSD give the following output
to the browser(IE5.0);
(after a 5 second pause)
----------8<-------snip-----------8<------start
--ThisRandomString
Content-type: text/html
First update at 18:22:47
--ThisRandomString
Content-type: text/html
Second update at 18:22:52
--ThisRandomString
----------8<-------snip-----------8<------end
And the following output to the browser(Netscape 4.6);
(after a 5 second pause)
----------8<-------snip-----------8<------start
Second update at 18:23:19
----------8<-------snip-----------8<------end
ie With Netscape I never see the
first update at ...
part of the output as I would expect.
I have also tried it with;
header("Content-type: multipart/mixed;boundary=ThisRandomString");
but it makes no difference, the behaviour is identical.
IE5 does not seem to understand multipart.
The multipart mime boundary does not seem to be working properly in
Netscape4.6.
Regards
Andrew Braund
> -----Original Message-----
> From: Greg Scott [mailto:[EMAIL PROTECTED]]
> Sent: Sunday, 25 March 2001 04:49
> To: [EMAIL PROTECTED]
> Subject: Re: [PHP] Delaying Printed Output
>
>
> > You might try using flush() after the prints.
> >
> I tried that too, but at least in Netscape 6, it still waits until
> everything is done before displaying. I think Jack must be correct that
> this isn't possible for browser display.
>
> Thanks,
> Greg
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