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I notice in the header() method of GT::CGI the headers are returned as a string ready for a print() regardless of whether the code is running under mod_perl or not, however in CGI.pm a call to Apache->request->send_cgi_header is made under mod_perl.

Does send_cgi_header perform any differently?
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Re: [Gmail] GT::CGI In reply to
After some further research it appears that there is not a great deal of difference between simply printing the header and using an Apache::Request object to call send_cgi_header.