Per RFC 2616 section 9.4, we SHOULD return the content-length if possible on HEAD requests (even for CGI requests). Also do it because it fixes the cause of .37's demise. This also fixes a condition seen on FreeBSD-4.6 where HEAD requests on CGI scripts would hang because the OS would return EAGAIN in log_script_err (via apr_file_gets). Since we never read the script output, this caused FreeBSD to not let us read stderr.
httpd/httpd/trunk/CHANGES
httpd/httpd/trunk/modules/generators/mod_cgi.c