_http_cmd
r = _http_cmd(conn, "%s: Basic %s", hdr, auth);
_http_cmd(conn, "%s %s://%s%s HTTP/1.1",
_http_cmd(conn, "%s %s HTTP/1.1",
_http_cmd(conn, "Host: %s", host);
_http_cmd(conn, "Referer: %s://%s%s",
_http_cmd(conn, "Referer: %s", p);
_http_cmd(conn, "User-Agent: %s", p);
_http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname());
_http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
_http_cmd(conn, "Connection: close");
_http_cmd(conn, "");