The "C<$c>" here refers to the Catalyst context, which is used to access
the Catalyst application. In addition to many other things, the Catalyst
context provides access to "response" and "request" objects. (See
-L<Catalyst>, L<Catalyst::Response>, and
+L<Catalyst::Runtime>, L<Catalyst::Response>, and
L<Catalyst::Request>)
C<$c-E<gt>response-E<gt>body> sets the HTTP response (see