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<li class="nav-item nav-item-1"><a href="index.html" accesskey="U">Patterns for Flask</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Application Dispatching</a></li>
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<div class="body" role="main">
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<section id="bsd-3-clause-license">
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<h1>BSD-3-Clause License<a class="headerlink" href="#bsd-3-clause-license" title="Link to this heading">¶</a></h1>
|
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<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>Copyright 2010 Pallets
|
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Redistribution and use in source and binary forms, with or without
|
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modification, are permitted provided that the following conditions are
|
||||
met:
|
||||
<section id="application-dispatching">
|
||||
<h1>Application Dispatching<a class="headerlink" href="#application-dispatching" title="Link to this heading">¶</a></h1>
|
||||
<p>Application dispatching is the process of combining multiple Flask
|
||||
applications on the WSGI level. You can combine not only Flask
|
||||
applications but any WSGI application. This would allow you to run a
|
||||
Django and a Flask application in the same interpreter side by side if
|
||||
you want. The usefulness of this depends on how the applications work
|
||||
internally.</p>
|
||||
<p>The fundamental difference from <a class="reference internal" href="packages.html"><span class="doc">Large Applications as Packages</span></a> is that in this case you
|
||||
are running the same or different Flask applications that are entirely
|
||||
isolated from each other. They run different configurations and are
|
||||
dispatched on the WSGI level.</p>
|
||||
<section id="working-with-this-document">
|
||||
<h2>Working with this Document<a class="headerlink" href="#working-with-this-document" title="Link to this heading">¶</a></h2>
|
||||
<p>Each of the techniques and examples below results in an <code class="docutils literal notranslate"><span class="pre">application</span></code>
|
||||
object that can be run with any WSGI server. For development, use the
|
||||
<code class="docutils literal notranslate"><span class="pre">flask</span> <span class="pre">run</span></code> command to start a development server. For production, see
|
||||
<a class="reference internal" href="../deploying/index.html"><span class="doc">Deploying to Production</span></a>.</p>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">Flask</span>
|
||||
|
||||
1. Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
|
||||
|
||||
2. Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in the
|
||||
documentation and/or other materials provided with the distribution.
|
||||
|
||||
3. Neither the name of the copyright holder nor the names of its
|
||||
contributors may be used to endorse or promote products derived from
|
||||
this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
||||
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
|
||||
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||||
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
||||
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
||||
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
<span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/'</span><span class="p">)</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">hello_world</span><span class="p">():</span>
|
||||
<span class="k">return</span> <span class="s1">'Hello World!'</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
</section>
|
||||
<section id="combining-applications">
|
||||
<h2>Combining Applications<a class="headerlink" href="#combining-applications" title="Link to this heading">¶</a></h2>
|
||||
<p>If you have entirely separated applications and you want them to work next
|
||||
to each other in the same Python interpreter process you can take
|
||||
advantage of the <code class="xref py py-class docutils literal notranslate"><span class="pre">werkzeug.wsgi.DispatcherMiddleware</span></code>. The idea
|
||||
here is that each Flask application is a valid WSGI application and they
|
||||
are combined by the dispatcher middleware into a larger one that is
|
||||
dispatched based on prefix.</p>
|
||||
<p>For example you could have your main application run on <code class="docutils literal notranslate"><span class="pre">/</span></code> and your
|
||||
backend interface on <code class="docutils literal notranslate"><span class="pre">/backend</span></code>.</p>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">werkzeug.middleware.dispatcher</span><span class="w"> </span><span class="kn">import</span> <span class="n">DispatcherMiddleware</span>
|
||||
<span class="kn">from</span><span class="w"> </span><span class="nn">frontend_app</span><span class="w"> </span><span class="kn">import</span> <span class="n">application</span> <span class="k">as</span> <span class="n">frontend</span>
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||||
<span class="kn">from</span><span class="w"> </span><span class="nn">backend_app</span><span class="w"> </span><span class="kn">import</span> <span class="n">application</span> <span class="k">as</span> <span class="n">backend</span>
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<span class="n">application</span> <span class="o">=</span> <span class="n">DispatcherMiddleware</span><span class="p">(</span><span class="n">frontend</span><span class="p">,</span> <span class="p">{</span>
|
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<span class="s1">'/backend'</span><span class="p">:</span> <span class="n">backend</span>
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<span class="p">})</span>
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</pre></div>
|
||||
</div>
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||||
</section>
|
||||
<section id="dispatch-by-subdomain">
|
||||
<h2>Dispatch by Subdomain<a class="headerlink" href="#dispatch-by-subdomain" title="Link to this heading">¶</a></h2>
|
||||
<p>Sometimes you might want to use multiple instances of the same application
|
||||
with different configurations. Assuming the application is created inside
|
||||
a function and you can call that function to instantiate it, that is
|
||||
really easy to implement. In order to develop your application to support
|
||||
creating new instances in functions have a look at the
|
||||
<a class="reference internal" href="appfactories.html"><span class="doc">Application Factories</span></a> pattern.</p>
|
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<p>A very common example would be creating applications per subdomain. For
|
||||
instance you configure your webserver to dispatch all requests for all
|
||||
subdomains to your application and you then use the subdomain information
|
||||
to create user-specific instances. Once you have your server set up to
|
||||
listen on all subdomains you can use a very simple WSGI application to do
|
||||
the dynamic application creation.</p>
|
||||
<p>The perfect level for abstraction in that regard is the WSGI layer. You
|
||||
write your own WSGI application that looks at the request that comes and
|
||||
delegates it to your Flask application. If that application does not
|
||||
exist yet, it is dynamically created and remembered.</p>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">threading</span><span class="w"> </span><span class="kn">import</span> <span class="n">Lock</span>
|
||||
|
||||
<span class="k">class</span><span class="w"> </span><span class="nc">SubdomainDispatcher</span><span class="p">:</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">domain</span><span class="p">,</span> <span class="n">create_app</span><span class="p">):</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">domain</span> <span class="o">=</span> <span class="n">domain</span>
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||||
<span class="bp">self</span><span class="o">.</span><span class="n">create_app</span> <span class="o">=</span> <span class="n">create_app</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">lock</span> <span class="o">=</span> <span class="n">Lock</span><span class="p">()</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">instances</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">get_application</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">host</span><span class="p">):</span>
|
||||
<span class="n">host</span> <span class="o">=</span> <span class="n">host</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">':'</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
|
||||
<span class="k">assert</span> <span class="n">host</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">domain</span><span class="p">),</span> <span class="s1">'Configuration error'</span>
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<span class="n">subdomain</span> <span class="o">=</span> <span class="n">host</span><span class="p">[:</span><span class="o">-</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">domain</span><span class="p">)]</span><span class="o">.</span><span class="n">rstrip</span><span class="p">(</span><span class="s1">'.'</span><span class="p">)</span>
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<span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">lock</span><span class="p">:</span>
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<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">instances</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">subdomain</span><span class="p">)</span>
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||||
<span class="k">if</span> <span class="n">app</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
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<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">create_app</span><span class="p">(</span><span class="n">subdomain</span><span class="p">)</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">instances</span><span class="p">[</span><span class="n">subdomain</span><span class="p">]</span> <span class="o">=</span> <span class="n">app</span>
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<span class="k">return</span> <span class="n">app</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="fm">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">environ</span><span class="p">,</span> <span class="n">start_response</span><span class="p">):</span>
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_application</span><span class="p">(</span><span class="n">environ</span><span class="p">[</span><span class="s1">'HTTP_HOST'</span><span class="p">])</span>
|
||||
<span class="k">return</span> <span class="n">app</span><span class="p">(</span><span class="n">environ</span><span class="p">,</span> <span class="n">start_response</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>This dispatcher can then be used like this:</p>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">myapplication</span><span class="w"> </span><span class="kn">import</span> <span class="n">create_app</span><span class="p">,</span> <span class="n">get_user_for_subdomain</span>
|
||||
<span class="kn">from</span><span class="w"> </span><span class="nn">werkzeug.exceptions</span><span class="w"> </span><span class="kn">import</span> <span class="n">NotFound</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">make_app</span><span class="p">(</span><span class="n">subdomain</span><span class="p">):</span>
|
||||
<span class="n">user</span> <span class="o">=</span> <span class="n">get_user_for_subdomain</span><span class="p">(</span><span class="n">subdomain</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">user</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
|
||||
<span class="c1"># if there is no user for that subdomain we still have</span>
|
||||
<span class="c1"># to return a WSGI application that handles that request.</span>
|
||||
<span class="c1"># We can then just return the NotFound() exception as</span>
|
||||
<span class="c1"># application which will render a default 404 page.</span>
|
||||
<span class="c1"># You might also redirect the user to the main page then</span>
|
||||
<span class="k">return</span> <span class="n">NotFound</span><span class="p">()</span>
|
||||
|
||||
<span class="c1"># otherwise create the application for the specific user</span>
|
||||
<span class="k">return</span> <span class="n">create_app</span><span class="p">(</span><span class="n">user</span><span class="p">)</span>
|
||||
|
||||
<span class="n">application</span> <span class="o">=</span> <span class="n">SubdomainDispatcher</span><span class="p">(</span><span class="s1">'example.com'</span><span class="p">,</span> <span class="n">make_app</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
</section>
|
||||
<section id="dispatch-by-path">
|
||||
<h2>Dispatch by Path<a class="headerlink" href="#dispatch-by-path" title="Link to this heading">¶</a></h2>
|
||||
<p>Dispatching by a path on the URL is very similar. Instead of looking at
|
||||
the <code class="docutils literal notranslate"><span class="pre">Host</span></code> header to figure out the subdomain one simply looks at the
|
||||
request path up to the first slash.</p>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">threading</span><span class="w"> </span><span class="kn">import</span> <span class="n">Lock</span>
|
||||
<span class="kn">from</span><span class="w"> </span><span class="nn">wsgiref.util</span><span class="w"> </span><span class="kn">import</span> <span class="n">shift_path_info</span>
|
||||
|
||||
<span class="k">class</span><span class="w"> </span><span class="nc">PathDispatcher</span><span class="p">:</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">default_app</span><span class="p">,</span> <span class="n">create_app</span><span class="p">):</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">default_app</span> <span class="o">=</span> <span class="n">default_app</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">create_app</span> <span class="o">=</span> <span class="n">create_app</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">lock</span> <span class="o">=</span> <span class="n">Lock</span><span class="p">()</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">instances</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">get_application</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">prefix</span><span class="p">):</span>
|
||||
<span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">lock</span><span class="p">:</span>
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">instances</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">prefix</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">app</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">create_app</span><span class="p">(</span><span class="n">prefix</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">app</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">instances</span><span class="p">[</span><span class="n">prefix</span><span class="p">]</span> <span class="o">=</span> <span class="n">app</span>
|
||||
<span class="k">return</span> <span class="n">app</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="fm">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">environ</span><span class="p">,</span> <span class="n">start_response</span><span class="p">):</span>
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_application</span><span class="p">(</span><span class="n">_peek_path_info</span><span class="p">(</span><span class="n">environ</span><span class="p">))</span>
|
||||
<span class="k">if</span> <span class="n">app</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
|
||||
<span class="n">shift_path_info</span><span class="p">(</span><span class="n">environ</span><span class="p">)</span>
|
||||
<span class="k">else</span><span class="p">:</span>
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">default_app</span>
|
||||
<span class="k">return</span> <span class="n">app</span><span class="p">(</span><span class="n">environ</span><span class="p">,</span> <span class="n">start_response</span><span class="p">)</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">_peek_path_info</span><span class="p">(</span><span class="n">environ</span><span class="p">):</span>
|
||||
<span class="n">segments</span> <span class="o">=</span> <span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"PATH_INFO"</span><span class="p">,</span> <span class="s2">""</span><span class="p">)</span><span class="o">.</span><span class="n">lstrip</span><span class="p">(</span><span class="s2">"/"</span><span class="p">)</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">"/"</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">segments</span><span class="p">:</span>
|
||||
<span class="k">return</span> <span class="n">segments</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
|
||||
<span class="k">return</span> <span class="kc">None</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>The big difference between this and the subdomain one is that this one
|
||||
falls back to another application if the creator function returns <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">myapplication</span><span class="w"> </span><span class="kn">import</span> <span class="n">create_app</span><span class="p">,</span> <span class="n">default_app</span><span class="p">,</span> <span class="n">get_user_for_prefix</span>
|
||||
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">make_app</span><span class="p">(</span><span class="n">prefix</span><span class="p">):</span>
|
||||
<span class="n">user</span> <span class="o">=</span> <span class="n">get_user_for_prefix</span><span class="p">(</span><span class="n">prefix</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">user</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
|
||||
<span class="k">return</span> <span class="n">create_app</span><span class="p">(</span><span class="n">user</span><span class="p">)</span>
|
||||
|
||||
<span class="n">application</span> <span class="o">=</span> <span class="n">PathDispatcher</span><span class="p">(</span><span class="n">default_app</span><span class="p">,</span> <span class="n">make_app</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
|
||||
|
|
@ -85,25 +221,39 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|||
<span id="sidebar-top"></span>
|
||||
<div class="sphinxsidebar" role="navigation" aria-label="Main">
|
||||
<div class="sphinxsidebarwrapper">
|
||||
|
||||
|
||||
<p class="logo"><a href="index.html">
|
||||
<img class="logo" src="_static/flask-vertical.png" alt="Logo of Flask"/>
|
||||
|
||||
|
||||
<p class="logo"><a href="../index.html">
|
||||
<img class="logo" src="../_static/flask-vertical.png" alt="Logo of Flask"/>
|
||||
</a></p>
|
||||
|
||||
|
||||
|
||||
<h3>Contents</h3>
|
||||
<ul>
|
||||
<li><a class="reference internal" href="#">Application Dispatching</a><ul>
|
||||
<li><a class="reference internal" href="#working-with-this-document">Working with this Document</a></li>
|
||||
<li><a class="reference internal" href="#combining-applications">Combining Applications</a></li>
|
||||
<li><a class="reference internal" href="#dispatch-by-subdomain">Dispatch by Subdomain</a></li>
|
||||
<li><a class="reference internal" href="#dispatch-by-path">Dispatch by Path</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
<h3>Navigation</h3>
|
||||
<ul>
|
||||
<li><a href="index.html">Overview</a>
|
||||
<li><a href="../index.html">Overview</a>
|
||||
<ul>
|
||||
<li>Previous: <a href="contributing.html" title="previous chapter">Contributing</a>
|
||||
<li>Next: <a href="changes.html" title="next chapter">Changes</a>
|
||||
<li><a href="index.html">Patterns for Flask</a>
|
||||
<ul>
|
||||
<li>Previous: <a href="appfactories.html" title="previous chapter">Application Factories</a>
|
||||
<li>Next: <a href="urlprocessors.html" title="next chapter">Using URL Processors</a></ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
<search id="searchbox" style="display: none" role="search">
|
||||
<h3 id="searchlabel">Quick search</h3>
|
||||
<div class="searchformwrapper">
|
||||
<form class="search" action="search.html" method="get">
|
||||
<form class="search" action="../search.html" method="get">
|
||||
<input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/>
|
||||
<input type="submit" value="Go" />
|
||||
</form>
|
||||
|
|
@ -119,4 +269,4 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|||
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 8.1.3.
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
</html>
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue