static int http_proxy_write(URLContext *h, const uint8_t *buf, int size)
{
    HTTPContext *s = h->priv_data;
    return ffurl_write(s->hd, buf, size);
}
static int http_proxy_write(URLContext *h, const uint8_t *buf, int size)
{
    HTTPContext *s = h->priv_data;
    return ffurl_write(s->hd, buf, size);
}