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97 lines
3.9 KiB
Markdown
97 lines
3.9 KiB
Markdown
---
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source:
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- urlpatterns.py
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---
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# Format suffixes
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> Section 6.2.1 does not say that content negotiation should be
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used all the time.
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>
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> — Roy Fielding, [REST discuss mailing list][cite]
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A common pattern for Web APIs is to use filename extensions on URLs to provide an endpoint for a given media type. For example, 'http://example.com/api/users.json' to serve a JSON representation.
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Adding format-suffix patterns to each individual entry in the URLconf for your API is error-prone and non-DRY, so REST framework provides a shortcut to adding these patterns to your URLConf.
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## format_suffix_patterns
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**Signature**: format_suffix_patterns(urlpatterns, suffix_required=False, allowed=None)
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Returns a URL pattern list which includes format suffix patterns appended to each of the URL patterns provided.
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Arguments:
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* **urlpatterns**: Required. A URL pattern list.
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* **suffix_required**: Optional. A boolean indicating if suffixes in the URLs should be optional or mandatory. Defaults to `False`, meaning that suffixes are optional by default.
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* **allowed**: Optional. A list or tuple of valid format suffixes. If not provided, a wildcard format suffix pattern will be used.
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Example:
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from rest_framework.urlpatterns import format_suffix_patterns
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from blog import views
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urlpatterns = [
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path('', views.apt_root),
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path('comments/', views.comment_list),
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path('comments/<int:pk>/', views.comment_detail)
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]
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urlpatterns = format_suffix_patterns(urlpatterns, allowed=['json', 'html'])
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When using `format_suffix_patterns`, you must make sure to add the `'format'` keyword argument to the corresponding views. For example:
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@api_view(['GET', 'POST'])
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def comment_list(request, format=None):
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# do stuff...
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Or with class-based views:
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class CommentList(APIView):
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def get(self, request, format=None):
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# do stuff...
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def post(self, request, format=None):
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# do stuff...
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The name of the kwarg used may be modified by using the `FORMAT_SUFFIX_KWARG` setting.
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Also note that `format_suffix_patterns` does not support descending into `include` URL patterns.
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### Using with `i18n_patterns`
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If using the `i18n_patterns` function provided by Django, as well as `format_suffix_patterns` you should make sure that the `i18n_patterns` function is applied as the final, or outermost function. For example:
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urlpatterns = [
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…
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]
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urlpatterns = i18n_patterns(
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format_suffix_patterns(urlpatterns, allowed=['json', 'html'])
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)
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---
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## Query parameter formats
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An alternative to the format suffixes is to include the requested format in a query parameter. REST framework provides this option by default, and it is used in the browsable API to switch between differing available representations.
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To select a representation using its short format, use the `format` query parameter. For example: `http://example.com/organizations/?format=csv`.
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The name of this query parameter can be modified using the `URL_FORMAT_OVERRIDE` setting. Set the value to `None` to disable this behavior.
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---
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## Accept headers vs. format suffixes
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There seems to be a view among some of the Web community that filename extensions are not a RESTful pattern, and that `HTTP Accept` headers should always be used instead.
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It is actually a misconception. For example, take the following quote from Roy Fielding discussing the relative merits of query parameter media-type indicators vs. file extension media-type indicators:
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“That's why I always prefer extensions. Neither choice has anything to do with REST.” — Roy Fielding, [REST discuss mailing list][cite2]
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The quote does not mention Accept headers, but it does make it clear that format suffixes should be considered an acceptable pattern.
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[cite]: http://tech.groups.yahoo.com/group/rest-discuss/message/5857
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[cite2]: https://groups.yahoo.com/neo/groups/rest-discuss/conversations/topics/14844
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