> For the complete documentation index, see [llms.txt](https://docs.natsclub.cn/cn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.natsclub.cn/cn/nats-gai-nian/core-nats/reqreply/reqreply_walkthrough.md).

# 请求/响应 演练

NATS supports [request-reply](/cn/nats-gai-nian/core-nats/reqreply.md) messaging. In this tutorial you explore how to exchange point-to-point messages using NATS.

## Prerequisites

If you have not already done so, you need to [install](/cn/nats-gai-nian/what-is-nats/walkthrough_setup.md) the `nats` CLI Tool and optionally, the nats-server on your machine.

## Walkthrough

Start two terminal sessions. These will be used to run the NATS request and reply clients.

### In one terminal, run the reply client listener

```bash
nats reply help.please 'OK, I CAN HELP!!!'
```

You should see the message: *Listening on \[help.please]*

This means that the NATS receiver client is listening for request messages on the "help.please" subject. In NATS, the receiver is a subscriber.

### In the other terminal, run the request client

```bash
nats request help.please 'I need help!'
```

The NATS requestor client makes a request by sending the message "I need help!" on the “help.please” subject.

The NATS receiver client receives the message, formulates the reply ("OK, I CAN HELP!!!"), and sends it to the inbox of the requester.