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<a href=".." >Different Routers</a>
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<h1 id="different-routers">Different Routers</h1>
<p>Reitit ships with several different implementations for the <code>Router</code> protocol, originally based on the <a href="https://github.com/pedestal/pedestal/tree/master/route" target="_blank">Pedestal</a> implementation. <code>router</code> function selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using <code>:router</code> option, see <a href="advanced/configuring_routers.md">configuring routers</a>.</p>
<table>
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<th>router</th>
<th>description</th>
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<tr>
<td><code>:linear-router</code></td>
<td>Matches the routes one-by-one starting from the top until a match is found. Slow, but works with all route trees.</td>
</tr>
<tr>
<td><code>:segment-router</code></td>
<td>Router that creates a optimized <a href="https://en.wikipedia.org/wiki/Trie" target="_blank">search trie</a> out of an route table. Much faster than <code>:linear-router</code> for wildcard routes. Valid only if there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
</tr>
<tr>
<td><code>:lookup-router</code></td>
<td>Fast router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters and there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
</tr>
<tr>
<td><code>:single-static-path-router</code></td>
<td>Super fast router: string-matches a route. Valid only if there is one static route.</td>
</tr>
<tr>
<td><code>:mixed-router</code></td>
<td>Contains two routers: <code>:segment-router</code> for wildcard routes and a <code>:lookup-router</code> or <code>:single-static-path-router</code> for static routes. Valid only if there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
</tr>
</tbody>
</table>
<p>The router name can be asked from the router:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/api/:users&quot;</span> <span class="hljs-symbol">::users</span>]]))
(<span class="hljs-name">r/router-name</span> router)
<span class="hljs-comment">; :mixed-router</span>
</code></pre>
<p>Overriding the router implementation:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/api/:users&quot;</span> <span class="hljs-symbol">::users</span>]]
{<span class="hljs-symbol">:router</span> r/linear-router}))
(<span class="hljs-name">r/router-name</span> router)
<span class="hljs-comment">; :linear-router</span>
</code></pre>
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