Wildcard subdomain - logging

[Neil Sheth]

Hello,

I'm trying to figure out my logging.  Right now, I have nginx acting
as a reverse proxy, sending requests to backend web servers running
apache.  For one part of my site, I have wildcard subdomains - these
are handled by my htaccess rules for apache.  (I enable something like
<aname>.mysite.com.  In htaccess, this is rewritten to something like
/mypage.php?name=<aname>.

Now, in my nginx access log, no matter what <aname> is, I see "GET /
".  Is there any way to get the original request string?  Or, perhaps
do some regex operation on the log write?  For my stats-tracking, I'd
like to be able to differentiate between different page hits.  A bit
at a loss how to get this!

Thanks for any help!

    Neil