How to exit from CGI without parameters?

(defun main ()
  (close *standard-input*)
  (close *standard-output*)
  (exit)) 

If I use the above as CGI, I get following:

--2017-03-27 21:04:19--  (try: 6)  http://localhost/test.cgi
Connecting to localhost|127.0.0.1|:80... connected.
HTTP request sent, awaiting response... No data received.
Retrying.

repeated.


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