[racket] web server log format

On Mon, Dec 12, 2011 at 11:30:59AM -0700, Jay McCarthy wrote:
> But the Racket Web server only has request logging by default, not response
> logging, so it makes something up in these positions. I will update the
> docs to mention this.

I think that a single dash is typically used if a value is missing or
unknown:

http://en.wikipedia.org/wiki/Common_Log_Format
A "-" in a field indicates missing data.

http://www.w3.org/TR/WD-logfile 
If a field is omitted for a particular entry a single dash "-" is
substituted.

Is there a performance reason for not logging information about the
response? It would seem that (especially) the response code would be
valuable to include by default?

Shalom,
Jordan