Tony Cheung wrote:
> If I want to use $CGI::POST_MAX ,how to wirte in my program,thanks.
Try reading the docs :
=item B<$CGI::POST_MAX>
If set to a non-negative integer, this variable puts a ceiling
on the size of POSTings, in bytes. If CGI.pm detects a POST
that is greater than the ceiling, it will immediately exit with an error
message. This value will affect both ordinary POSTs and
multipart POSTs, meaning that it limits the maximum size of file
uploads as well. You should set this to a reasonably high
value, such as 1 megabyte.
=item B<$CGI::DISABLE_UPLOADS>
If set to a non-zero value, this will disable file uploads
completely. Other fill-out form values will work as usual.
=back
You can use these variables in either of two ways.
=over 4
=item B<1. On a script-by-script basis>
Set the variable at the top of the script, right after the "use" statement:
use CGI qw/:standard/;
use CGI::Carp 'fatalsToBrowser';
$CGI::POST_MAX=1024 * 100; # max 100K posts
$CGI::DISABLE_UPLOADS = 1; # no uploads
=item B<2. Globally for all scripts>
Open up CGI.pm, find the definitions for $POST_MAX and
$DISABLE_UPLOADS, and set them to the desired values. You'll
find them towards the top of the file in a subroutine named
initialize_globals().
=back
An attempt to send a POST larger than $POST_MAX bytes will cause
I<param()> to return an empty CGI parameter list. You can test for
this event by checking I<cgi_error()>, either after you create the CGI
object or, if you are using the function-oriented interface, call
<param()> for the first time. If the POST was intercepted, then
cgi_error() will return the message "413 POST too large".
This error message is actually defined by the HTTP protocol, and is
designed to be returned to the browser as the CGI script's status
code. For example:
$uploaded_file = param('upload');
if (!$uploaded_file && cgi_error()) {
print header(-status=>cgi_error());
exit 0;
}
However it isn't clear that any browser currently knows what to do
with this status code. It might be better just to create an
HTML page that warns the user of the problem.
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