flask/flask-docs/deploying/waitress.html
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<section id="waitress">
<h1>Waitress<a class="headerlink" href="#waitress" title="Link to this heading"></a></h1>
<p><a class="reference external" href="https://docs.pylonsproject.org/projects/waitress/">Waitress</a> is a pure Python WSGI server.</p>
<ul class="simple">
<li><p>It is easy to configure.</p></li>
<li><p>It supports Windows directly.</p></li>
<li><p>It is easy to install as it does not require additional dependencies
or compilation.</p></li>
<li><p>It does not support streaming requests, full request data is always
buffered.</p></li>
<li><p>It uses a single process with multiple thread workers.</p></li>
</ul>
<p>This page outlines the basics of running Waitress. Be sure to read its
documentation and <code class="docutils literal notranslate"><span class="pre">waitress-serve</span> <span class="pre">--help</span></code> to understand what features
are available.</p>
<section id="installing">
<h2>Installing<a class="headerlink" href="#installing" title="Link to this heading"></a></h2>
<p>Create a virtualenv, install your application, then install
<code class="docutils literal notranslate"><span class="pre">waitress</span></code>.</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>$ cd hello-app
$ python -m venv .venv
$ . .venv/bin/activate
$ pip install . # install your application
$ pip install waitress
</pre></div>
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</section>
<section id="running">
<h2>Running<a class="headerlink" href="#running" title="Link to this heading"></a></h2>
<p>The only required argument to <code class="docutils literal notranslate"><span class="pre">waitress-serve</span></code> tells it how to load
your Flask application. The syntax is <code class="docutils literal notranslate"><span class="pre">{module}:{app}</span></code>. <code class="docutils literal notranslate"><span class="pre">module</span></code> is
the dotted import name to the module with your application. <code class="docutils literal notranslate"><span class="pre">app</span></code> is
the variable with the application. If youre using the app factory
pattern, use <code class="docutils literal notranslate"><span class="pre">--call</span> <span class="pre">{module}:{factory}</span></code> instead.</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span># equivalent to &#39;from hello import app&#39;
$ waitress-serve --host 127.0.0.1 hello:app
# equivalent to &#39;from hello import create_app; create_app()&#39;
$ waitress-serve --host 127.0.0.1 --call hello:create_app
Serving on http://127.0.0.1:8080
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">--host</span></code> option binds the server to local <code class="docutils literal notranslate"><span class="pre">127.0.0.1</span></code> only.</p>
<p>Logs for each request arent shown, only errors are shown. Logging can
be configured through the Python interface instead of the command line.</p>
</section>
<section id="binding-externally">
<h2>Binding Externally<a class="headerlink" href="#binding-externally" title="Link to this heading"></a></h2>
<p>Waitress should not be run as root because it would cause your
application code to run as root, which is not secure. However, this
means it will not be possible to bind to port 80 or 443. Instead, a
reverse proxy such as <a class="reference internal" href="nginx.html"><span class="doc">nginx</span></a> or <a class="reference internal" href="apache-httpd.html"><span class="doc">Apache httpd</span></a> should be used
in front of Waitress.</p>
<p>You can bind to all external IPs on a non-privileged port by not
specifying the <code class="docutils literal notranslate"><span class="pre">--host</span></code> option. Dont do this when using a reverse
proxy setup, otherwise it will be possible to bypass the proxy.</p>
<p><code class="docutils literal notranslate"><span class="pre">0.0.0.0</span></code> is not a valid address to navigate to, youd use a specific
IP address in your browser.</p>
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<h3>Contents</h3>
<ul>
<li><a class="reference internal" href="#">Waitress</a><ul>
<li><a class="reference internal" href="#installing">Installing</a></li>
<li><a class="reference internal" href="#running">Running</a></li>
<li><a class="reference internal" href="#binding-externally">Binding Externally</a></li>
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