Just a guess here...

Have you tried to download the PDF using the $mech connection you are already using? Say using: 

$mech->get($url_to_pdf);
$mech->save_content( $filename );

[download]

Maybe this is a cookie issue. I believe that $mech will accept cookies by default. This might mean that using a separate mirror process causes a different connection to take place and the web server maybe does not allow a direct connection from that page without a cookie.

It might work for you in the browser since your browser would already have a cookie.

In reply to Re^3: Crawling with Parallel::ForkManager by tokpela
in thread Crawling with Parallel::ForkManager by listanand

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