also define the output format in the URL if you don't want to add an <code>Accept</code> header:
                    </p>
                    <pre><code class="language-http">POST /graphviz/svg</code></pre>
                    <pre><code class="language-request">Content-Type: text/plain

digraph G {
  Hello->World
}</code></pre>
                    <p>
                        The same concept applies when sending the diagram as <code>JSON</code>:
                    </p>
                    <pre><code class