As discussed by Ovid at Preventing DOS attacks with CGI.pm, one of the key elements of all code employing CGI is the definition of $CGI::POST_MAX, thereby limiting the maximum accepted size of the submitted request entity. If this value, defined in bytes, is exceeded by the HTTP request, the result is the generation of a request entity too large error upon initiation of the CGI object that is returned to the HTTP client.

In a reply to my post here, Hero Zzyzzx asked how a more custom error handling response for over-sized requests could be incorporated into code - The result, with some liberties taken from the CGI module, is the code below:

#!/usr/bin/perl -Tw

use CGI;
use strict;

BEGIN {
    my $POST_MAX = 512 * 1024;

    my $content_length = defined $ENV{'CONTENT_LENGTH'} ? $ENV{'CONTEN
+T_LENGTH'} : 0;
    if ( ($POST_MAX > 0) && ($content_length > $POST_MAX) ) {
        #   custom request entity too large error handling
    }
}

[download]

In reply to Custom error handling for oversized CGI request entities by rob_au

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.