You can't read from STDIN once it's been read from. You can't go backwards in it. So save it!
BEGIN {
  pipe local (*IN, *OUT);
  while (<STDIN>) {
    print OUT;
    # do what you need to with $_
  }
  close OUT;
  open STDIN, "<&IN";
}

use CGI;

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In reply to Save STDIN from CGI.pm by japhy

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