server _onHttpRequest(): ensure non-empty params
server _onHttpRequest(): ensure non-empty params

LinusU/bittorrent-tracker,prozacchiwawa/bittorrent-tracker,maxogden/bittorrent-tracker,jhiesey/bittorrent-tracker,feross/bittorrent-tracker,precisit/bittorrent-tracker,feross/bittorrent-tracker,jhiesey/bittorrent-tracker