当表单数据有效时，表单数据实例排队并等待发送到服务器（当与服务器建立连接时）。

When the forms data is valid, the forms data instance is queued and waits to be sent to the server (when a connection to the server is made).

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注意：如果创建新的代理超出了这一限制，那么连接会排队等待下一个可用的代理来服务请求。

Note: If creating a new agent exceeds this limit, then the connection is queued up and waits for the next available agent to service the request.

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注意，一旦发送完所有排队等待的消息后，它将关闭连接。

Notice that once it has sent all of the queued up messages, it closes the connection.

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