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docs/developer/tutorials/reqreply.html
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<p>NATS supports request/reply messaging. In this tutorial you explore how to exchange point-to-point messages using NATS.</p>
<h2 id="prerequisites"><a name="prerequisites" class="plugin-anchor" href="#prerequisites"><i class="fa fa-link" aria-hidden="true"></i></a>Prerequisites</h2>
<p>Go and the NATS server should be installed.</p>
<h2 id="1-start-the-nats-server"><a name="1-start-the-nats-server" class="plugin-anchor" href="#1-start-the-nats-server"><i class="fa fa-link" aria-hidden="true"></i></a>1. Start the NATS server</h2>
<h3 id="1-start-the-nats-server"><a name="1-start-the-nats-server" class="plugin-anchor" href="#1-start-the-nats-server"><i class="fa fa-link" aria-hidden="true"></i></a>1. Start the NATS server</h3>
<pre class="language-"><code class="lang-sh">% nats-server
</code></pre>
<h2 id="2-start-two-terminal-sessions"><a name="2-start-two-terminal-sessions" class="plugin-anchor" href="#2-start-two-terminal-sessions"><i class="fa fa-link" aria-hidden="true"></i></a>2. Start two terminal sessions</h2>
<h3 id="2-start-two-terminal-sessions"><a name="2-start-two-terminal-sessions" class="plugin-anchor" href="#2-start-two-terminal-sessions"><i class="fa fa-link" aria-hidden="true"></i></a>2. Start two terminal sessions</h3>
<p>You will use these sessions to run the NATS request and reply clients.</p>
<h2 id="3-change-to-the-examples-directory"><a name="3-change-to-the-examples-directory" class="plugin-anchor" href="#3-change-to-the-examples-directory"><i class="fa fa-link" aria-hidden="true"></i></a>3. Change to the examples directory</h2>
<h3 id="3-change-to-the-examples-directory"><a name="3-change-to-the-examples-directory" class="plugin-anchor" href="#3-change-to-the-examples-directory"><i class="fa fa-link" aria-hidden="true"></i></a>3. Change to the examples directory</h3>
<pre class="language-"><code class="lang-sh">% <span class="token function">cd</span> <span class="token variable">$GOPATH</span>/src/github.com/nats-io/nats/examples
</code></pre>
<h2 id="4-in-one-terminal-run-the-reply-client-listener"><a name="4-in-one-terminal-run-the-reply-client-listener" class="plugin-anchor" href="#4-in-one-terminal-run-the-reply-client-listener"><i class="fa fa-link" aria-hidden="true"></i></a>4. In one terminal, run the reply client listener</h2>
<h3 id="4-in-one-terminal-run-the-reply-client-listener"><a name="4-in-one-terminal-run-the-reply-client-listener" class="plugin-anchor" href="#4-in-one-terminal-run-the-reply-client-listener"><i class="fa fa-link" aria-hidden="true"></i></a>4. In one terminal, run the reply client listener</h3>
<pre class="language-"><code class="lang-sh">% go run nats-rply.go foo <span class="token string">&quot;this is my response&quot;</span>
</code></pre>
<p>You should see the message <code>Receiver is listening</code>, and that the NATS receiver client is listening on the &quot;help.please&quot; subject. The reply client acts as a receiver, listening for message requests. In NATS, the receiver is a subscriber.</p>
<h2 id="5-in-the-other-terminal-run-the-request-client"><a name="5-in-the-other-terminal-run-the-request-client" class="plugin-anchor" href="#5-in-the-other-terminal-run-the-request-client"><i class="fa fa-link" aria-hidden="true"></i></a>5. In the other terminal, run the request client</h2>
<h3 id="5-in-the-other-terminal-run-the-request-client"><a name="5-in-the-other-terminal-run-the-request-client" class="plugin-anchor" href="#5-in-the-other-terminal-run-the-request-client"><i class="fa fa-link" aria-hidden="true"></i></a>5. In the other terminal, run the request client</h3>
<pre class="language-"><code class="lang-sh">% go run nats-req.go foo <span class="token string">&quot;request payload&quot;</span>
</code></pre>
<p>The NATS requestor client makes a request by sending the message &quot;some message&quot; on the &#x201C;help.please&#x201D; subject.</p>
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