interface: try hard not to infinite loop while getting headers
interface: try hard not to infinite loop while getting headers

pooler/electrum-ltc,cryptapus/electrum,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,cryptapus/electrum,wakiyamap/electrum-mona,cryptapus/electrum,fujicoin/electrum-fjc,neocogent/electrum,vialectrum/vialectrum,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,neocogent/electrum,vialectrum/vialectrum,vialectrum/vialectrum,spesmilo/electrum,fujicoin/electrum-fjc,neocogent/electrum,wakiyamap/electrum-mona,fujicoin/electrum-fjc