I am using mod_perl version 1.9. The exact version is 1.99921. I am running a script under PerlRun. This is what my conf file looks like: 
 <Location /perl>
     SetHandler perl-script
     PerlResponseHandler ModPerl::PerlRun
     PerlOptions +ParseHeaders
     Options +ExecCGI
  </Location>

[download]
So the script is running under /perl. The first time the script executes, everything is fine. But the next time, a header is not sent and there is an internal server error.

I am using the header function from CGI.pm. What I am doing is this in a base class: 

use CGI qw(header);

my $html = defined($ENV{'SERVER_SOFTWARE'}) ? header : '';

# More stuff gets added to $html before it prints to STDOUT

[download]
Why is the header sent the first time and not the next?

Thanks monks.

In reply to mod_perl 1.9 header error by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.