ap_register_include_handler 3829 modules/filters/mod_include.c     ssi_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);
ap_register_include_handler 3877 modules/filters/mod_include.c     APR_REGISTER_OPTIONAL_FN(ap_register_include_handler);
ap_register_include_handler 1226 modules/generators/mod_cgi.c     cgi_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);
ap_register_include_handler  880 modules/generators/mod_cgid.c         cgid_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);