[mp2] BUG with mod_deflate and $|=1 (20014:Error string not specified)

[Bill Marrs]

When I use Apache 2.0.46, mod_deflate with mod_perl-1.99_09 (or the latest 
mod_perl-2.0 CVS), perl buffering is off ($|=1), and my perl script prints 
nothing (e.g. 'print "";'), I get the following error:

[Wed Jul 02 10:10:00 2003] [error] 19513: ModPerl::RegistryBB: 20014:Error 
string not specified yet at /var/www/perl/test.pl line 6.

If I switch to running the script under mod_cgi or if I remove the "$|=1;" 
line, I do not get an error.

Here is my script:

#!/usr/bin/perl
$|=1;
print "Content-Type: text/html\n\n";
print "hello world<P>";
# This line causes the error
print "";
httpd.conf snipit:

Alias /perl/ /var/www/perl/
<Location /perl>
  AddOutputFilterByType DEFLATE text/*
  SetOutputFilter DEFLATE
  AllowOverride  None
  SetHandler     perl-script
  PerlHandler    ModPerl::RegistryBB
  PerlSendHeader On
  Options        +ExecCGI
</Location>
I've worked-around this problem by changing my print "" to print " ".  It's 
not a major issue for me, I'm just letting you know.  Let me know if you 
need any more info.

-bill