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  <section id="engines">
<span id="settings-engines"></span><h1><code class="docutils literal notranslate"><span class="pre">engines:</span></code><a class="headerlink" href="#engines" title="Link to this heading">¶</a></h1>
<aside class="sidebar">
<p class="sidebar-title">Further reading ..</p>
<ul class="simple">
<li><p><a class="reference internal" href="../../user/configured_engines.html#configured-engines"><span class="std std-ref">Configured Engines</span></a></p></li>
<li><p><a class="reference internal" href="../../dev/engines/engine_overview.html#engines-dev"><span class="std std-ref">Engine Overview</span></a></p></li>
</ul>
</aside>
<p>In the section <code class="docutils literal notranslate"><span class="pre">engines:</span></code> is a list of the engines that are to be made
available in the instance.  Each list entry is in turn a key/value mapping.</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">engines</span><span class="p">:</span>

<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">dummy.online</span>
<span class="w">    </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">dummy</span>
<span class="w">    </span><span class="l l-Scalar l-Scalar-Plain">..</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">dummy.offline</span>
<span class="w">    </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">dummy-offline</span>
<span class="w">    </span><span class="l l-Scalar l-Scalar-Plain">..</span>
<span class="w">  </span><span class="l l-Scalar l-Scalar-Plain">..</span>
</pre></div>
</div>
<p>In the code example below a <em>full fledged</em> example of a YAML setup from a dummy
engine is shown.  Most of the options have a default value or even are optional.</p>
<div class="admonition hint">
<p class="admonition-title">Hint</p>
<p>A few more options are possible, but they are pretty specific to some
engines (<a class="reference internal" href="../../dev/engines/index.html#engine-implementations"><span class="std std-ref">Engine Implementations</span></a>).</p>
</div>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example</span>
<span class="w">  </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example</span>
<span class="w">  </span><span class="nt">shortcut</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">demo</span>
<span class="w">  </span><span class="nt">base_url</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;https://{language}.example.com/&#39;</span>
<span class="w">  </span><span class="nt">send_accept_language_header</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span>
<span class="w">  </span><span class="nt">categories</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">general</span>
<span class="w">  </span><span class="nt">timeout</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">3.0</span>
<span class="w">  </span><span class="nt">api_key</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;apikey&#39;</span>
<span class="w">  </span><span class="nt">disabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span>
<span class="w">  </span><span class="nt">language</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">en_US</span>
<span class="w">  </span><span class="nt">tokens</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">[</span><span class="w"> </span><span class="s">&#39;my-secret-token&#39;</span><span class="w"> </span><span class="p p-Indicator">]</span>
<span class="w">  </span><span class="nt">weight</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span>
<span class="w">  </span><span class="nt">display_error_messages</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span>
<span class="w">  </span><span class="nt">about</span><span class="p">:</span>
<span class="w">     </span><span class="nt">website</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">https://example.com</span>
<span class="w">     </span><span class="nt">wikidata_id</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Q306656</span>
<span class="w">     </span><span class="nt">official_api_documentation</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">https://example.com/api-doc</span>
<span class="w">     </span><span class="nt">use_official_api</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span>
<span class="w">     </span><span class="nt">require_api_key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span>
<span class="w">     </span><span class="nt">results</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">HTML</span>

<span class="w">  </span><span class="c1"># overwrite values from section &#39;outgoing:&#39;</span>
<span class="w">  </span><span class="nt">enable_http2</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span>
<span class="w">  </span><span class="nt">retries</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span>
<span class="w">  </span><span class="nt">max_connections</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">100</span>
<span class="w">  </span><span class="nt">max_keepalive_connections</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">10</span>
<span class="w">  </span><span class="nt">keepalive_expiry</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">5.0</span>
<span class="w">  </span><span class="nt">using_tor_proxy</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span>
<span class="w">  </span><span class="nt">proxies</span><span class="p">:</span>
<span class="w">    </span><span class="nt">http</span><span class="p">:</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">http://proxy1:8080</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">http://proxy2:8080</span>
<span class="w">    </span><span class="nt">https</span><span class="p">:</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">http://proxy1:8080</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">http://proxy2:8080</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">socks5://user:password@proxy3:1080</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">socks5h://user:password@proxy4:1080</span>

<span class="w">  </span><span class="c1"># other network settings</span>
<span class="w">  </span><span class="nt">enable_http</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span>
<span class="w">  </span><span class="nt">retry_on_http_error</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"> </span><span class="c1"># or 403 or [404, 429]</span>
</pre></div>
</div>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">name</span></code> :</dt><dd><p>Name that will be used across SearXNG to define this engine.  In settings, on
the result page…</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">engine</span></code> :</dt><dd><p>Name of the python file used to handle requests and responses to and from this
search engine.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">shortcut</span></code> :</dt><dd><p>Code used to execute bang requests (in this case using <code class="docutils literal notranslate"><span class="pre">!bi</span></code>)</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">base_url</span></code><span class="classifier">optional</span></dt><dd><p>Part of the URL that should be stable across every request.  Can be useful to
use multiple sites using only one engine, or updating the site URL without
touching at the code.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">send_accept_language_header</span></code> :</dt><dd><p>Several engines that support languages (or regions) deal with the HTTP header
<code class="docutils literal notranslate"><span class="pre">Accept-Language</span></code> to build a response that fits to the locale.  When this
option is activated, the language (locale) that is selected by the user is used
to build and send a <code class="docutils literal notranslate"><span class="pre">Accept-Language</span></code> header in the request to the origin
search engine.</p>
</dd>
</dl>
<dl id="engine-categories">
<dt><code class="docutils literal notranslate"><span class="pre">categories</span></code><span class="classifier">optional</span></dt><dd><p>Specifies to which categories the engine should be added.  Engines can be
assigned to multiple categories.</p>
<p>Categories can be shown as tabs (<a class="reference internal" href="settings_categories_as_tabs.html#settings-categories-as-tabs"><span class="std std-ref">categories_as_tabs:</span></a>) in the
UI.  A search in a tab (in the UI) will query all engines that are active in
this tab.  In the preferences page (<code class="docutils literal notranslate"><span class="pre">/preferences</span></code>) – under <em>engines</em> –
users can select what engine should be active when querying in this tab.</p>
<p>Alternatively, <a class="reference internal" href="../../user/search-syntax.html#search-syntax"><span class="std std-ref">!bang</span></a> can be used to search all engines
in a category, regardless of whether they are active or not, or whether they
are in a tab of the UI or not.  For example, <code class="docutils literal notranslate"><span class="pre">!dictionaries</span></code> can be used to
query all search engines in that category (group).</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">timeout</span></code><span class="classifier">optional</span></dt><dd><p>Timeout of the search with the current search engine.  Overwrites
<code class="docutils literal notranslate"><span class="pre">request_timeout</span></code> from <a class="reference internal" href="settings_outgoing.html#settings-outgoing"><span class="std std-ref">outgoing:</span></a>.  <strong>Be careful, it will
modify the global timeout of SearXNG.</strong></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">api_key</span></code><span class="classifier">optional</span></dt><dd><p>In a few cases, using an API needs the use of a secret key.  How to obtain them
is described in the file.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">disabled</span></code><span class="classifier">optional</span></dt><dd><p>To disable by default the engine, but not deleting it.  It will allow the user
to manually activate it in the settings.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">inactive</span></code>: optional</dt><dd><p>Remove the engine from the settings (<em>disabled &amp; removed</em>).</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">language</span></code><span class="classifier">optional</span></dt><dd><p>If you want to use another language for a specific engine, you can define it
by using the ISO code of language (and region), like <code class="docutils literal notranslate"><span class="pre">fr</span></code>, <code class="docutils literal notranslate"><span class="pre">en-US</span></code>,
<code class="docutils literal notranslate"><span class="pre">de-DE</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">tokens</span></code><span class="classifier">optional</span></dt><dd><p>A list of secret tokens to make this engine <em>private</em>, more details see
<a class="reference internal" href="#private-engines"><span class="std std-ref">Private Engines (tokens)</span></a>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">weight</span></code><span class="classifier">default <code class="docutils literal notranslate"><span class="pre">1</span></code></span></dt><dd><p>Weighting of the results of this engine.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">display_error_messages</span></code><span class="classifier">default <code class="docutils literal notranslate"><span class="pre">true</span></code></span></dt><dd><p>When an engine returns an error, the message is displayed on the user interface.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">network</span></code><span class="classifier">optional</span></dt><dd><p>Use the network configuration from another engine.
In addition, there are two default networks:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">ipv4</span></code> set <code class="docutils literal notranslate"><span class="pre">local_addresses</span></code> to <code class="docutils literal notranslate"><span class="pre">0.0.0.0</span></code> (use only IPv4 local addresses)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">ipv6</span></code> set <code class="docutils literal notranslate"><span class="pre">local_addresses</span></code> to <code class="docutils literal notranslate"><span class="pre">::</span></code> (use only IPv6 local addresses)</p></li>
</ul>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">enable_http</span></code><span class="classifier">optional</span></dt><dd><p>Enable HTTP for this engine (by default only HTTPS is enabled).</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">retry_on_http_error</span></code><span class="classifier">optional</span></dt><dd><p>Retry request on some HTTP status code.</p>
<p>Example:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">true</span></code> : on HTTP status code between 400 and 599.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">403</span></code> : on HTTP status code 403.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">[403,</span> <span class="pre">429]</span></code>: on HTTP status code 403 and 429.</p></li>
</ul>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">proxies</span></code> :</dt><dd><p>Overwrites proxy settings from <a class="reference internal" href="settings_outgoing.html#settings-outgoing"><span class="std std-ref">outgoing:</span></a>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">using_tor_proxy</span></code> :</dt><dd><p>Using tor proxy (<code class="docutils literal notranslate"><span class="pre">true</span></code>) or not (<code class="docutils literal notranslate"><span class="pre">false</span></code>) for this engine.  The default is
taken from <code class="docutils literal notranslate"><span class="pre">using_tor_proxy</span></code> of the <a class="reference internal" href="settings_outgoing.html#settings-outgoing"><span class="std std-ref">outgoing:</span></a>.</p>
</dd>
</dl>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">max_keepalive_connection#s</span></code> :</dt><dd><dl class="simple">
<dt><a class="reference external" href="https://www.python-httpx.org/advanced/#pool-limit-configuration">Pool limit configuration</a>, overwrites value <code class="docutils literal notranslate"><span class="pre">pool_maxsize</span></code> from</dt><dd><p><a class="reference internal" href="settings_outgoing.html#settings-outgoing"><span class="std std-ref">outgoing:</span></a> for this engine.</p>
</dd>
</dl>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">max_connections</span></code> :</dt><dd><p><a class="reference external" href="https://www.python-httpx.org/advanced/#pool-limit-configuration">Pool limit configuration</a>, overwrites value <code class="docutils literal notranslate"><span class="pre">pool_connections</span></code> from
<a class="reference internal" href="settings_outgoing.html#settings-outgoing"><span class="std std-ref">outgoing:</span></a> for this engine.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">keepalive_expiry</span></code> :</dt><dd><p><a class="reference external" href="https://www.python-httpx.org/advanced/#pool-limit-configuration">Pool limit configuration</a>, overwrites value <code class="docutils literal notranslate"><span class="pre">keepalive_expiry</span></code> from
<a class="reference internal" href="settings_outgoing.html#settings-outgoing"><span class="std std-ref">outgoing:</span></a> for this engine.</p>
</dd>
</dl>
<section id="private-engines-tokens">
<span id="private-engines"></span><h2>Private Engines (<code class="docutils literal notranslate"><span class="pre">tokens</span></code>)<a class="headerlink" href="#private-engines-tokens" title="Link to this heading">¶</a></h2>
<p>Administrators might find themselves wanting to limit access to some of the
enabled engines on their instances.  It might be because they do not want to
expose some private information through <a class="reference internal" href="../../dev/engines/index.html#offline-engines"><span class="std std-ref">Offline Engines</span></a>.  Or they would
rather share engines only with their trusted friends or colleagues.</p>
<aside class="sidebar">
<p class="sidebar-title">info</p>
<p>Initial sponsored by <a class="reference external" href="https://nlnet.nl/discovery">Search and Discovery Fund</a> of <a class="reference external" href="https://nlnet.nl/">NLnet Foundation</a>.</p>
</aside>
<p>To solve this issue the concept of <em>private engines</em> exists.</p>
<p>A new option was added to engines named <cite>tokens</cite>.  It expects a list of strings.
If the user making a request presents one of the tokens of an engine, they can
access information about the engine and make search requests.</p>
<p>Example configuration to restrict access to the Arch Linux Wiki engine:</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">arch linux wiki</span>
<span class="w">  </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">archlinux</span>
<span class="w">  </span><span class="nt">shortcut</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">al</span>
<span class="w">  </span><span class="nt">tokens</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">[</span><span class="w"> </span><span class="s">&#39;my-secret-token&#39;</span><span class="w"> </span><span class="p p-Indicator">]</span>
</pre></div>
</div>
<p>Unless a user has configured the right token, the engine is going to be hidden
from them.  It is not going to be included in the list of engines on the
Preferences page and in the output of <cite>/config</cite> REST API call.</p>
<p>Tokens can be added to one’s configuration on the Preferences page under “Engine
tokens”.  The input expects a comma separated list of strings.</p>
<p>The distribution of the tokens from the administrator to the users is not carved
in stone.  As providing access to such engines implies that the admin knows and
trusts the user, we do not see necessary to come up with a strict process.
Instead, we would like to add guidelines to the documentation of the feature.</p>
</section>
<section id="example-multilingual-search">
<h2>Example: Multilingual Search<a class="headerlink" href="#example-multilingual-search" title="Link to this heading">¶</a></h2>
<p>SearXNG does not support true multilingual search.  You have to use the language
prefix in your search query when searching in a different language.</p>
<p>But there is a workaround: By adding a new search engine with a different
language, SearXNG will search in your default and other language.</p>
<p>Example configuration in settings.yml for a German and English speaker:</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">search</span><span class="p">:</span>
<span class="w">    </span><span class="nt">default_lang </span><span class="p">:</span><span class="w"> </span><span class="s">&quot;de&quot;</span>
<span class="w">    </span><span class="l l-Scalar l-Scalar-Plain">...</span>

<span class="nt">engines</span><span class="p">:</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name </span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">google english</span>
<span class="w">    </span><span class="nt">engine </span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">google</span>
<span class="w">    </span><span class="nt">language </span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">en</span>
<span class="w">    </span><span class="l l-Scalar l-Scalar-Plain">...</span>
</pre></div>
</div>
<p>When searching, the default google engine will return German results and
“google english” will return English results.</p>
</section>
</section>


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