I'm using [`HTTP::Server::Simple::CGI`](http://p3rl.org/HTTP::Server::Simple::CGI) for a light-weight HTTP server. That gives me a CGI object in a callback function when a HTTP request is accepted.

How can I access the incoming HTTP headers, especially non-standard headers?
The environment variables are only the standard ones.

`cgi->param` gives me only the form parameters.

Thanks!
chris