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