func (r HTTPMap) AppendSysResourceIfExists(sr string, sys *system.System) (*HTTP, system.HTTP, bool) {
    sysres := sys.NewHTTP(sr, sys, util.Config{})
    // FIXME: Do we want to be silent about errors?
    res, _ := NewHTTP(sysres, util.Config{})
    if e, _ := sysres.Exists(); e != true {