I can only get CGI::SSI to DWIM when it's supplied with an absolute HTTP URL to the SSI file. For some reason all the other methods listed in POD fail with [an error occurred while processing this directive]. YMMV 
$shtml = $ssi->include(virtual => 'http://path/to.ssi');

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In reply to Re^8: including the content of a .shtml file into a cgi page by Anonymous Monk
in thread including the content of a .shtml file into a cgi page by ketaki

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