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‎docs/dev/configuration.html‎

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<html lang="en">
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<meta charset="utf-8" />
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<title>HAProxy version 3.4-dev1-49 - Configuration Manual</title>
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<title>HAProxy version 3.4-dev1-53 - Configuration Manual</title>
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<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
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<link href="https://raw.githubusercontent.com/thomaspark/bootswatch/v3.3.7/cerulean/bootstrap.min.css" rel="stylesheet" />
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<link href="../css/page.css?0.4.2-15" rel="stylesheet" />
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You can use <strong>left</strong> and <strong>right</strong> arrow keys to navigate between chapters.<br>
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</p>
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<p class="text-right">
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<small>Converted with <a href="https://github.com/cbonte/haproxy-dconv">haproxy-dconv</a> v<b>0.4.2-15</b> on <b>2025/12/31</b></small>
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<small>Converted with <a href="https://github.com/cbonte/haproxy-dconv">haproxy-dconv</a> v<b>0.4.2-15</b> on <b>2026/01/01</b></small>
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</p>
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</div>
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<!-- /.sidebar -->
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<div class="text-center">
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<h1><a href="http://www.haproxy.org/" title="HAProxy"><img src="../img/HAProxyCommunityEdition_60px.png?0.4.2-15" /></a></h1>
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<h2>Configuration Manual</h2>
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<p><strong>version 3.4-dev1-49</strong></p>
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<p><strong>version 3.4-dev1-53</strong></p>
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<p>
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2025/12/10<br>
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- byte 3..4: tcp.win
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- byte 5..6: tcp.options.mss, or zero if absent
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When the &lt;mode&gt; argument is not set or is zero, the fingerprint is solely
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made of the 7 bytes described above. When the &lt;mode&gt; is 1, it starts by the
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7-byte block above, and is followed by the list of TCP option kinds, for 0
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to 40 extra bytes, as returned by &quot;<a href="#tcp.options_list">tcp.options_list</a>&quot;.
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The &lt;mode&gt; argument permits to append more information to the fingerprint. By
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default, when the &lt;mode&gt; argument is not set or is zero, the fingerprint is
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solely made of the 7 bytes described above. If &lt;mode&gt; is specified as another
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value, it then corresponds to the sum of the following values, and the
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respective components will be concatenated to the fingerprint, in the order
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below:
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- 1: the received TTL value is appended to the fingerprint (1 byte)
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- 2: the list of TCP option kinds, as returned by &quot;<a href="#tcp.options_list">tcp.options_list</a>&quot;,
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made of 0 to 40 extra bytes, is appended to the fingerprint
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- 4: the source IP address is appended to the fingerprint, which adds
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4 bytes for IPv4 and 16 for IPv6.
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</pre><div class="separator">
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<span class="label label-success">Example:</span>
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<pre class="prettyprint">
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<code>frontend test
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<div class="example-desc">Make a 12..24 bytes fingerprint using the base FP, the TTL and the source address (1+4=5):</div><code>frontend test
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mode http
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bind :4445 tcp-ss 1
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tcp-request connection set-var(sess.syn) fc_saved_syn
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http-request return status 200 content-type text/plain lf-string \
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&quot;src=%[var(sess.syn),ip.src] fp=%[var(sess.syn),ip.fp,hex]\n&quot;
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&quot;src=%[var(sess.syn),ip.src] fp=%[var(sess.syn),ip.fp(5),hex]\n&quot;
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</code></pre>
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</div><pre class="text">See also &quot;<a href="#fc_saved_syn">fc_saved_syn</a>&quot;, &quot;<a href="#tcp-ss">tcp-ss</a>&quot;, &quot;<a href="#eth.data">eth.data</a>&quot;, &quot;<a href="#ip.df">ip.df</a>&quot;, &quot;<a href="#ip.ttl">ip.ttl</a>&quot;, &quot;<a href="#tcp.win">tcp.win</a>&quot;,
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&quot;<a href="#tcp.options.mss">tcp.options.mss</a>&quot;, and &quot;<a href="#tcp.options_list">tcp.options_list</a>&quot;.
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which can represent a client identifier found in a request for
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instance.
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* string [length &lt;len&gt;]
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* string [len &lt;len&gt;]
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A table declared with &quot;type string&quot; will store substrings of
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up to &lt;len&gt; characters. If the string provided by the pattern
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extractor is larger than &lt;len&gt;, it will be truncated before
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limited to 32 characters. Increasing the length can have a
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non-negligible memory usage impact.
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* binary [length &lt;len&gt;]
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* binary [len &lt;len&gt;]
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A table declared with &quot;type binary&quot; will store binary blocks
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of &lt;len&gt; bytes. If the block provided by the pattern
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extractor is larger than &lt;len&gt;, it will be truncated before
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<br>
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<hr>
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<div class="text-right">
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HAProxy 3.4-dev1-49 &ndash; Configuration Manual<br>
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HAProxy 3.4-dev1-53 &ndash; Configuration Manual<br>
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<small>, 2025/12/10</small>
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</div>
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</div>

‎docs/dev/intro.html‎

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<meta charset="utf-8" />
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<title>HAProxy version 3.4-dev1-49 - Starter Guide</title>
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<title>HAProxy version 3.4-dev1-53 - Starter Guide</title>
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<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
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<link href="https://raw.githubusercontent.com/thomaspark/bootswatch/v3.3.7/cerulean/bootstrap.min.css" rel="stylesheet" />
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<link href="../css/page.css?0.4.2-15" rel="stylesheet" />
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You can use <strong>left</strong> and <strong>right</strong> arrow keys to navigate between chapters.<br>
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</p>
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<p class="text-right">
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<small>Converted with <a href="https://github.com/cbonte/haproxy-dconv">haproxy-dconv</a> v<b>0.4.2-15</b> on <b>2025/12/31</b></small>
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<small>Converted with <a href="https://github.com/cbonte/haproxy-dconv">haproxy-dconv</a> v<b>0.4.2-15</b> on <b>2026/01/01</b></small>
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</p>
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<div class="text-center">
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<h1><a href="http://www.haproxy.org/" title="HAProxy"><img src="../img/HAProxyCommunityEdition_60px.png?0.4.2-15" /></a></h1>
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<h2>Starter Guide</h2>
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<p><strong>version 3.4-dev1-49</strong></p>
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<p><strong>version 3.4-dev1-53</strong></p>
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<p>
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<br>
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<br>
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<hr>
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<div class="text-right">
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HAProxy 3.4-dev1-49 &ndash; Starter Guide<br>
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HAProxy 3.4-dev1-53 &ndash; Starter Guide<br>
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<small>, </small>
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</div>
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</div>

‎docs/dev/management.html‎

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<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
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<link href="https://raw.githubusercontent.com/thomaspark/bootswatch/v3.3.7/cerulean/bootstrap.min.css" rel="stylesheet" />
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You can use <strong>left</strong> and <strong>right</strong> arrow keys to navigate between chapters.<br>
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</p>
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<p class="text-right">
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<small>Converted with <a href="https://github.com/cbonte/haproxy-dconv">haproxy-dconv</a> v<b>0.4.2-15</b> on <b>2025/12/31</b></small>
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<small>Converted with <a href="https://github.com/cbonte/haproxy-dconv">haproxy-dconv</a> v<b>0.4.2-15</b> on <b>2026/01/01</b></small>
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</p>
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<!-- /.sidebar -->
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<h1><a href="http://www.haproxy.org/" title="HAProxy"><img src="../img/HAProxyCommunityEdition_60px.png?0.4.2-15" /></a></h1>
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<h2>Management Guide</h2>
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<p><strong>version 3.4-dev1-49</strong></p>
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<p><strong>version 3.4-dev1-53</strong></p>
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<p>
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<br>
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HAProxy 3.4-dev1-49 &ndash; Management Guide<br>
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HAProxy 3.4-dev1-53 &ndash; Management Guide<br>
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<small>, </small>
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</div>
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</div>

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