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            <li class="main"> +                    <a href="#returning-urls">Returning URLs</a> +                  </li> + +                   +                    <li> +                      <a href="#reverse">reverse</a> +                    </li> +                   +                    <li> +                      <a href="#reverse_lazy">reverse_lazy</a> +                    </li> +                   + +                 + +                 + +              </ul> + +            </div> +          </div> + +          <div id="main-content" class="span9"> +             +               +                <a class="github" href="https://github.com/tomchristie/django-rest-framework/tree/master/rest_framework/reverse.py"> +                  <span class="label label-info">reverse.py</span> +                </a> +               +             + +            <h1 id="returning-urls">Returning URLs</h1> +<blockquote> +<p>The central feature that distinguishes the REST architectural style from other network-based styles is its emphasis on a uniform interface between components.</p> +<p>— Roy Fielding, <a href="http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm#sec_5_1_5">Architectural Styles and the Design of Network-based Software Architectures</a></p> +</blockquote> +<p>As a rule, it's probably better practice to return absolute URIs from your Web APIs, such as <code>http://example.com/foobar</code>, rather than returning relative URIs, such as <code>/foobar</code>.</p> +<p>The advantages of doing so are:</p> +<ul> +<li>It's more explicit.</li> +<li>It leaves less work for your API clients.</li> +<li>There's no ambiguity about the meaning of the string when it's found in representations such as JSON that do not have a native URI type.</li> +<li>It makes it easy to do things like markup HTML representations with hyperlinks.</li> +</ul> +<p>REST framework provides two utility functions to make it more simple to return absolute URIs from your Web API.</p> +<p>There's no requirement for you to use them, but if you do then the self-describing API will be able to automatically hyperlink its output for you, which makes browsing the API much easier.</p> +<h2 id="reverse">reverse</h2> +<p><strong>Signature:</strong> <code>reverse(viewname, *args, **kwargs)</code></p> +<p>Has the same behavior as <a href="https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse"><code>django.core.urlresolvers.reverse</code></a>, except that it returns a fully qualified URL, using the request to determine the host and port.</p> +<p>You should <strong>include the request as a keyword argument</strong> to the function, for example:</p> +<pre><code>from rest_framework.reverse import reverse +from rest_framework.views import APIView +from django.utils.timezone import now + +class APIRootView(APIView): +    def get(self, request): +        year = now().year +        data = { +            ... +            'year-summary-url': reverse('year-summary', args=[year], request=request) +        } +        return Response(data) +</code></pre> +<h2 id="reverse_lazy">reverse_lazy</h2> +<p><strong>Signature:</strong> <code>reverse_lazy(viewname, *args, **kwargs)</code></p> +<p>Has the same behavior as <a href="https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse-lazy"><code>django.core.urlresolvers.reverse_lazy</code></a>, except that it returns a fully qualified URL, using the request to determine the host and port.</p> +<p>As with the <code>reverse</code> function, you should <strong>include the request as a keyword argument</strong> to the function, for example:</p> +<pre><code>api_root = reverse_lazy('api-root', request=request) +</code></pre> + +          </div> +          <!--/span--> +        </div> +        <!--/row--> +      </div> +      <!--/.fluid-container--> +    </div> +    <!--/.body content--> +    <div id="push"></div> +  </div> +  <!--/.wrapper --> + +  <footer class="span12"> +    <p>Sponsored by <a 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