module.exports = {
    isValidErrorCode: function(code) {
        return (code >= 1000 && code <= 1010 && code != 1004 && code != 1005 && code != 1006) ||
               (code >= 3000 && code <= 4999);
    },
    1000: 'normal',
    1001: 'going away',
    1002: 'protocol error',
    1003: 'unsupported data',
    1004: 'reserved',
    1005: 'reserved for extensions',
    1006: 'reserved for extensions',
    1007: 'inconsistent or invalid data',
    1008: 'policy violation',
    1009: 'message too big',
    1010: 'extension handshake missing',
};