use LWP::Curl;
use Net::Curl::Easy qw(:constants);

my $lwpcurl = LWP::Curl->new();

my $referer = 'http://server.com/:5555';
my $post_url = 'http://userid:password@server.com:5555/receive';

open(my $fh, "<", "test.xml");
$lwpcurl->{agent}->setopt( CURLOPT_READDATA, $fh );
$lwpcurl->{agent}->setopt( CURLOPT_HEADERDATA, ['Content-Type:text/xml
+'] );

my $content = $lwpcurl->post($post_url, {}, $referer);
[download]

First, this *is* your code, and you're not checking whether the file opened successfully for read. Second, why are you breaking encapsulation by modifying the innards of the object?

Also, where are you getting the examples for calling setopt()? Everything I've found takes a reference, which you're not passing in.

Here's an example from Net::Curl::Easy:

$self->setopt( CURLOPT_FILE, \$self->{body} );
$self->setopt( CURLOPT_HEADERDATA, \$self->{head} );
[download]

I don't see any direct use examples for CURLOPT_READDATA.

I'm not in a position to test at the moment, so this is just a very wild guess, but first, ensure you handle opens correctly, then try the code as-is. If it still fails, try changing $lwpcurl->{agent}->setopt( CURLOPT_READDATA, $fh ); to $lwpcurl->{agent}->setopt( CURLOPT_FILE, $fh );. If that still doesn't work, try <c>$lwpcurl->{agent}->setopt( CURLOPT_FILE, \$fh );. All that said, I really, really don't think that modifying the agent like that was intended by the developers (I could be wrong though).

Can you please post a link to where you're taking your examples from, or what you're basing your code on?

The open() I referenced is directly from LWP/Curl.pm, thus it is not my code.

As for the setopt references, I'll be honest, I could not find any examples. I did attempt passing the filehandle reference, but resulted in the same error.

As for the setip() examples, I got them from previous posts here in a different thread

regardless of either:

$lwpcurl->{agent}->setopt( CURLOPT_FILE, \$fh );
$lwpcurl->{agent}->setopt( CURLOPT_FILE, $fh );
[download]

both generate the same previous error:

Can't use an undefined value as filehandle reference at /home/geof/httppost/lib/perl5/site_perl/5.8.8/LWP/Curl.pm line 236.