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56 lines
2.4 KiB
Markdown
56 lines
2.4 KiB
Markdown
<a class="github" href="reverse.py"></a>
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# Returning URLs
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> The central feature that distinguishes the REST architectural style from other network-based styles is its emphasis on a uniform interface between components.
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>
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> — Roy Fielding, [Architectural Styles and the Design of Network-based Software Architectures][cite]
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As a rule, it's probably better practice to return absolute URIs from your Web APIs, such as `http://example.com/foobar`, rather than returning relative URIs, such as `/foobar`.
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The advantages of doing so are:
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* It's more explicit.
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* It leaves less work for your API clients.
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* 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.
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* It makes it easy to do things like markup HTML representations with hyperlinks.
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REST framework provides two utility functions to make it more simple to return absolute URIs from your Web API.
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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.
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## reverse
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**Signature:** `reverse(viewname, *args, **kwargs)`
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Has the same behavior as [`django.core.urlresolvers.reverse`][reverse], except that it returns a fully qualified URL, using the request to determine the host and port.
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You should **include the request as a keyword argument** to the function, for example:
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from rest_framework.reverse import reverse
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from rest_framework.views import APIView
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from django.utils.timezone import now
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class APIRootView(APIView):
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def get(self, request):
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year = now().year
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data = {
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...
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'year-summary-url': reverse('year-summary', args=[year], request=request)
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}
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return Response(data)
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## reverse_lazy
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**Signature:** `reverse_lazy(viewname, *args, **kwargs)`
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Has the same behavior as [`django.core.urlresolvers.reverse_lazy`][reverse-lazy], except that it returns a fully qualified URL, using the request to determine the host and port.
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As with the `reverse` function, you should **include the request as a keyword argument** to the function, for example:
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api_root = reverse_lazy('api-root', request=request)
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[cite]: http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm#sec_5_1_5
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[reverse]: https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse
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[reverse-lazy]: https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse-lazy
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