NATS supports request/reply messaging. In this tutorial you explore how to exchange point-to-point messages using NATS.
Go and the NATS server should be installed.
1. Start the NATS server
2. Start two terminal sessions
You will use these sessions to run the NATS request and reply clients.
3. Change to the examples directory
% cd $GOPATH/src/github.com/nats-io/nats.go/examples
4. In one terminal, run the reply client listener
% go run nats-rply/main.go 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 requests messages on the "help.please" subject. In NATS, the receiver is a subscriber.
5. In the other terminal, run the request client
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.
