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43 lines
1.2 KiB
Markdown
43 lines
1.2 KiB
Markdown
# Explore NATS Request/Reply
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NATS supports request/reply messaging. In this tutorial you explore how to exchange point-to-point messages using NATS.
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## Prerequisites
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Go and the NATS server should be installed.
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### 1. Start the NATS server
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```bash
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% nats-server
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```
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### 2. Start two terminal sessions
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You will use these sessions to run the NATS request and reply clients.
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### 3. Change to the examples directory
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```bash
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% cd $GOPATH/src/github.com/nats-io/nats.go/examples
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```
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### 4. In one terminal, run the reply client listener
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```bash
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% go run nats-rply/main.go foo "this is my response"
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```
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You should see the message `Receiver is listening`, and that the NATS receiver client is listening on the "help.please" subject. The reply client acts as a receiver, listening for message requests. In NATS, the receiver is a subscriber.
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### 5. In the other terminal, run the request client
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```bash
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% go run nats-req/main.go foo "request payload"
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```
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The NATS requestor client makes a request by sending the message "some message" on the “help.please” subject.
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The NATS receiver client receives the message, formulates the reply \("OK, I CAN HELP!!!\), and sends it to the inbox of the requester.
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