Create a HTTP::Engine::Request object from the client request
If you are on a CGI environment, you need to receive all the data from
%ENV and such. If you are running on a mod_perl process, you need to muck
In any case, you need to construct a valid HTTP::Engine::Request object
so the application handler can do the real work.
Accept a HTTP::Engine::Response object, send it back to the client
The application handler must return an HTTP::Engine::Response object.
In turn, the interface needs to do whatever necessary to present this
object to the client. In a CGI environment, you would write to STDOUT.
In mod_perl, you need to call the appropriate $r->headers methods and/or