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如何在Dart的WebSocket中保持会话活动？

[英]How to keep the session alive within WebSocket in Dart?

原文 2015-11-04 06:08:31 3 1 javascript/ session/ dart

HttpSession's lastSeen is updated only if there is a new request. HttpSession的lastSeen仅在有新请求时才更新。 However, in my environment, I have a WebSocket connection and I'd like to keep the session alive as long as the Web connection is alive. 但是，在我的环境中，我有一个WebSocket连接，并且只要Web连接处于活动状态，我都希望保持会话处于活动状态。 But, I can't find a right method to do it. 但是，我找不到正确的方法来做到这一点。

Firing another HTTP request periodically could be a solution, but I'm looking for something that can be done within the WebScoket's handler. 定期触发另一个HTTP请求可能是一种解决方案，但我正在寻找可以在WebScoket的处理程序中完成的操作。

Note: the WebSocket connection won't be closed. 注意：WebSocket连接不会关闭。 Rather, the session can be timed out. 而是，会话可以超时。 It means request.session can return a different instance when processing one WebSocket message. 这意味着request.session在处理一条WebSocket消息时可以返回不同的实例。

1 个解决方案

As far as I know the WebSockets already have support for ping control frames to keep the connection alive. 据我所知，WebSockets已经支持ping控制帧以保持连接有效。 See The official spec . 请参阅官方规格。

As far as I can tell I have never seen an WebSocket to be closed early. 据我所知，我从未见过WebSocket早日关闭。