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Full Discussion: Perl CGI. no output until backend script is done
Top Forums Shell Programming and Scripting Perl CGI. no output until backend script is done Post 302444946 by honglus on Friday 13th of August 2010 08:46:13 AM
Old 08-13-2010
Quote:
Originally Posted by pludi
Perl buffers output on stdout by default untill the buffer is full, or a newline is found. You can force output either by adding ',"\n"' to the end of your print statements, or by disabling output buffering by adding this line near the top:
Code:
$| = 1;

But even then it's not guaranteed that the browser will start rendering the page before it received all the content.
$| doesn't work, To make it simple, I tested following script. I expect "OK, starting time consuming process " appeared first, then "All done" aftter 5 seconds. But they all appeared all together after 5 secs.

BTW: I use apache2 with mod_perl2

Code:
#!/usr/bin/perl -wT

use strict;
$| = 1;

print "Content-type: text/plain\n\n";

print "OK, starting time consuming process ... \n";


for ( my $loop = 1; $loop <= 5; $loop++ ) {
    print "Iteration: $loop\n";
    ## Perform some time consuming task here ##
    sleep 1;
}
print "All Done!\n";

Last edited by honglus; 08-13-2010 at 10:18 AM..
 

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