FETCH_UNKNOWN
{ SOCKS5_ERR_UNSPECIFIED, FETCH_UNKNOWN, "SOCKS5: Unspecified error" },
fetchLastErrCode = FETCH_UNKNOWN;
{ -1, FETCH_UNKNOWN, "Unknown resolver error" }
{ -1, FETCH_UNKNOWN, "Unknown parser error" }
&& fetchLastErrCode != FETCH_UNKNOWN