Пардон!
Все решается просто
[code]
static u_char buffer1[255];
ngx_cpymem(buffer1,r->args.data, r->args.len);
buffer1[r->args.len] ='\0';
ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_ENOTDIR, "URL
\"%s\" | ", buffer1);
[/code]
Posted at Nginx Forum: http://forum.nginx.org/read.php?21,149152,149163#msg-149163