django-rest-framework/docs/api-guide/format-suffixes.md
Francisco Couzo 041b88f8bb
Improve style, fix some typos (#8405)
* Improve style, fix some typos

* Update docs/api-guide/fields.md

Co-authored-by: Tom Christie <tom@tomchristie.com>

Co-authored-by: Tom Christie <tom@tomchristie.com>
2022-10-19 11:20:11 +01:00

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---
source:
- urlpatterns.py
---
# Format suffixes
> Section 6.2.1 does not say that content negotiation should be
used all the time.
>
> &mdash; Roy Fielding, [REST discuss mailing list][cite]
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.
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.
## format_suffix_patterns
**Signature**: format_suffix_patterns(urlpatterns, suffix_required=False, allowed=None)
Returns a URL pattern list which includes format suffix patterns appended to each of the URL patterns provided.
Arguments:
* **urlpatterns**: Required. A URL pattern list.
* **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.
* **allowed**: Optional. A list or tuple of valid format suffixes. If not provided, a wildcard format suffix pattern will be used.
Example:
from rest_framework.urlpatterns import format_suffix_patterns
from blog import views
urlpatterns = [
path('', views.apt_root),
path('comments/', views.comment_list),
path('comments/<int:pk>/', views.comment_detail)
]
urlpatterns = format_suffix_patterns(urlpatterns, allowed=['json', 'html'])
When using `format_suffix_patterns`, you must make sure to add the `'format'` keyword argument to the corresponding views. For example:
@api_view(['GET', 'POST'])
def comment_list(request, format=None):
# do stuff...
Or with class-based views:
class CommentList(APIView):
def get(self, request, format=None):
# do stuff...
def post(self, request, format=None):
# do stuff...
The name of the kwarg used may be modified by using the `FORMAT_SUFFIX_KWARG` setting.
Also note that `format_suffix_patterns` does not support descending into `include` URL patterns.
### Using with `i18n_patterns`
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:
urlpatterns = [
]
urlpatterns = i18n_patterns(
format_suffix_patterns(urlpatterns, allowed=['json', 'html'])
)
---
## Query parameter formats
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.
To select a representation using its short format, use the `format` query parameter. For example: `http://example.com/organizations/?format=csv`.
The name of this query parameter can be modified using the `URL_FORMAT_OVERRIDE` setting. Set the value to `None` to disable this behavior.
---
## Accept headers vs. format suffixes
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.
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:
&ldquo;That's why I always prefer extensions. Neither choice has anything to do with REST.&rdquo; &mdash; Roy Fielding, [REST discuss mailing list][cite2]
The quote does not mention Accept headers, but it does make it clear that format suffixes should be considered an acceptable pattern.
[cite]: http://tech.groups.yahoo.com/group/rest-discuss/message/5857
[cite2]: https://groups.yahoo.com/neo/groups/rest-discuss/conversations/topics/14844