func (c *Config) Update(ncfg Config) {
	configLock.Lock()
	defer configLock.Unlock()

	c.Enable = ncfg.Enable
	c.Endpoint = ncfg.Endpoint
	c.BlockSize = ncfg.BlockSize
	c.clnt = ncfg.clnt
}

// cache related errors
var (
	ErrInvalidArgument = errors.New("invalid argument")
	ErrKeyMissing      = errors.New("key is missing")
)

const (
	mcacheV1Check  = "/_mcache/v1/check"