When testing the WP-Debug plugin with a fresh install of WP 2.2.3 (with theme Connections Reloaded using wp_footer() function, no other plugin activated) I don't get HTTP request headers:
This is a list of all HTTP request headers.
Fatal error: Call to undefined function: getallheaders() in /home/nomad/public_html/jp/wp-content/plugins/wp-debug/krumo/class.krumo.php on line 260