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<h1 id="the-serve-command"><a class="header" href="#the-serve-command">The serve command</a></h1>
<p>The serve command is used to preview a book by serving it via HTTP at
<code>localhost:3000</code> by default:</p>
<pre><code class="language-bash">mdbook serve
</code></pre>
<p>The <code>serve</code> command watches the book's <code>src</code> directory for
changes, rebuilding the book and refreshing clients for each change; this includes
re-creating deleted files still mentioned in <code>SUMMARY.md</code>! A websocket
connection is used to trigger the client-side refresh.</p>
<p><em><strong>Note:</strong></em> <em>The <code>serve</code> command is for testing a book's HTML output, and is not
intended to be a complete HTTP server for a website.</em></p>
<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
<p>The <code>serve</code> command can take a directory as an argument to use as the book's
root instead of the current working directory.</p>
<pre><code class="language-bash">mdbook serve path/to/book
</code></pre>
<h3 id="server-options"><a class="header" href="#server-options">Server options</a></h3>
<p>The <code>serve</code> hostname defaults to <code>localhost</code>, and the port defaults to <code>3000</code>. Either option can be specified on the command line:</p>
<pre><code class="language-bash">mdbook serve path/to/book -p 8000 -n 127.0.0.1
</code></pre>
<h4 id="--open"><a class="header" href="#--open">--open</a></h4>
<p>When you use the <code>--open</code> (<code>-o</code>) flag, mdbook will open the book in your
default web browser after starting the server.</p>
<h4 id="--dest-dir"><a class="header" href="#--dest-dir">--dest-dir</a></h4>
<p>The <code>--dest-dir</code> (<code>-d</code>) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the <code>build.build-dir</code> key in
<code>book.toml</code>, or to <code>./book</code>.</p>
<h4 id="specify-exclude-patterns"><a class="header" href="#specify-exclude-patterns">Specify exclude patterns</a></h4>
<p>The <code>serve</code> command will not automatically trigger a build for files listed in
the <code>.gitignore</code> file in the book root directory. The <code>.gitignore</code> file may
contain file patterns described in the <a href="https://git-scm.com/docs/gitignore">gitignore
documentation</a>. This can be useful for
ignoring temporary files created by some editors.</p>
<p><em><strong>Note:</strong></em> <em>Only the <code>.gitignore</code> from the book root directory is used. Global
<code>$HOME/.gitignore</code> or <code>.gitignore</code> files in parent directories are not used.</em></p>
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