cgi - cgi struct
fmt - printf style format with args
DESCRIPTION
cgi_redirect_uri will redirect the user to another page on
your site. This version takes the full URL, including
protocol/domain/port/path.
As with all printf style commands, you should
not call this with arbitrary input that may contain %
characters, if you are forwarding something directly,
use a format like cgi_redirect (cgi, "%s", buf)