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<h1 id="create-a-backend">Create a backend<a class="headerlink" href="#create-a-backend" title="Permanent link">&para;</a></h1>
<p>As we said, a backend is the combination of a transport and a strategy. That way, you can create a complete strategy exactly fitting your needs.</p>
<p>For this, you have to use the <code>AuthenticationBackend</code> class.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span> <span class="nn">fastapi_users.authentication</span> <span class="kn">import</span> <span class="n">AuthenticationBackend</span><span class="p">,</span> <span class="n">BearerTransport</span><span class="p">,</span> <span class="n">JWTStrategy</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">SECRET</span> <span class="o">=</span> <span class="s2">&quot;SECRET&quot;</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="n">bearer_transport</span> <span class="o">=</span> <span class="n">BearerTransport</span><span class="p">(</span><span class="n">tokenUrl</span><span class="o">=</span><span class="s2">&quot;auth/jwt/login&quot;</span><span class="p">)</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="k">def</span> <span class="nf">get_jwt_strategy</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">JWTStrategy</span><span class="p">:</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="k">return</span> <span class="n">JWTStrategy</span><span class="p">(</span><span class="n">secret</span><span class="o">=</span><span class="n">SECRET</span><span class="p">,</span> <span class="n">lifetime_seconds</span><span class="o">=</span><span class="mi">3600</span><span class="p">)</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="n">auth_backend</span> <span class="o">=</span> <span class="n">AuthenticationBackend</span><span class="p">(</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;jwt&quot;</span><span class="p">,</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="n">transport</span><span class="o">=</span><span class="n">bearer_transport</span><span class="p">,</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">get_strategy</span><span class="o">=</span><span class="n">get_jwt_strategy</span><span class="p">,</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="p">)</span>
</code></pre></div>
<p>As you can see, instantiation is quite simple. It accepts the following arguments:</p>
<ul>
<li><code>name</code> (<code>str</code>): Name of the backend. Each backend should have a unique name.</li>
<li><code>transport</code> (<code>Transport</code>): An instance of a <code>Transport</code> class.</li>
<li><code>get_strategy</code> (<code>Callable[..., Strategy]</code>): A dependency callable returning an instance of a <code>Strategy</code> class.</li>
</ul>
<h2 id="next-steps">Next steps<a class="headerlink" href="#next-steps" title="Permanent link">&para;</a></h2>
<p>You can have as many authentication backends as you wish. You'll then have to pass those backends to your <code>FastAPIUsers</code> instance and generate an auth router for each one of them.</p>
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