Function http_request_free

ds4_server.c:11088–11091

    if (!s->trace || !id) return;
    pthread_mutex_lock(&s->trace_mu);
    fputs("\n\n--- trace: ", s->trace);
    va_list ap;
    va_start(ap, fmt);
    vfprintf(s->trace, fmt, ap);
    va_end(ap);
    fputs(" ---\n\n", s->trace);
    fflush(s->trace);