Do not set m.Expires if cache: no is set

server/server.go

@@ -589,7 +589,9 @@ func (s *Server) handlePublishWithoutResponse(r *http.Request, v *visitor) (*mes
 	}
 	m.Sender = v.IP()
 	m.User = v.MaybeUserID()
-	m.Expires = time.Unix(m.Time, 0).Add(v.Limits().MessageExpiryDuration).Unix()
+	if cache {
+		m.Expires = time.Unix(m.Time, 0).Add(v.Limits().MessageExpiryDuration).Unix()
+	}
 	if err := s.handlePublishBody(r, v, m, body, unifiedpush); err != nil {
 		return nil, err
 	}