如果登录成功则允许用户访问，若是登录被拒绝则显示消息指示找不到用户名和密码。
Allow the user access if the login succeeded or deny the user access and provide a message to indicate that the username and password could not be found.
因为不存在其他消息遭到拒绝的指示，所以除非您请求将消息发送到死信队列，否则发送应用程序可能丢失该消息。
Because no other indication of message rejection exists, the sending application can lose the message unless you request that it be sent to the dead-letter queue.
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