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速响应的目的。 如网站的用户注册场景，在用户注册成功后，还需要发送注册邮件与注册短信，这两个流程使用RabbitMQ消息服务通知邮件发送系统与短信发送系统，从而提升注册流程的响应速度。 图1 串行发送注册邮件与短信流程 图2 借助消息队列异步发送注册邮件与短信流程 错峰流控与流量削峰
配置RabbitMQ单一活跃消费者 单一活跃消费者（Single Active Consumer）表示队列中可以注册多个消费者，但是只允许一个消费者消费消息，只有在此消费者出现异常时，才会自动转移到另一个消费者进行消费。单一活跃消费者适用于需要保证消息消费顺序性，同时提供高可靠能力的场景。
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
// In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables
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