[racket] Web server warnings?

For awhile now the webserver spits out abunch of these messages:

peek-byte: input port is closed
  context...:
   /home/jordan/bin/lib/racket/collects/web-server/private/dispatch-server-unit.rkt:74:2:
  connection-loop

I think it only happens when the server is using SSL, is it an indication that
my code has a problem, or something inherent in the server?

Thanks,
Jordan