A Django App that adds CORS (Cross-Origin Resource Sharing) headers to responses.
Although JSON-P is useful, it is strictly limited to GET requests. CORS builds on top of XmlHttpRequest to allow developers to make cross-domain requests, similar to same-domain requests. Read more about it here: http://www.html5rocks.com/en/tutorials/cors/
Install by downloading the source and running:
python setup.py install
or
pip install django-cors-headers
and then add it to your installed apps:
INSTALLED_APPS = (
...
'corsheaders',
...
)
You will also need to add a middleware class to listen in on responses:
MIDDLEWARE_CLASSES = (
...
'corsheaders.middleware.CorsMiddleware',
'django.middleware.common.CommonMiddleware',
...
)
Note that CorsMiddleware needs to come before Django's CommonMiddleware if you are using Django's USE_ETAGS = True setting, otherwise the CORS headers will be lost from the 304 not-modified responses, causing errors in some browsers.
Add hosts that are allowed to do cross-site requests to CORS_ORIGIN_WHITELIST or set CORS_ORIGIN_ALLOW_ALL to True to allow all hosts.
CORS_ORIGIN_ALLOW_ALL: if True, the whitelist will not be used and all origins will be accepted
Default:
CORS_ORIGIN_ALLOW_ALL = False
CORS_ORIGIN_WHITELIST: specify a list of origin hostnames that are authorized to make a cross-site HTTP request
Example:
CORS_ORIGIN_WHITELIST = (
'google.com',
'hostname.example.com'
)
Default:
CORS_ORIGIN_WHITELIST = ()
CORS_ORIGIN_REGEX_WHITELIST: specify a regex list of origin hostnames that are authorized to make a cross-site HTTP request; Useful when you have a large amount of subdomains for instance.
Example:
CORS_ORIGIN_REGEX_WHITELIST = ('^(https?://)?(\w+\.)?google\.com$', )
Default:
CORS_ORIGIN_REGEX_WHITELIST = ()
You may optionally specify these options in settings.py to override the defaults. Defaults are shown below:
CORS_URLS_REGEX: specify a URL regex for which to enable the sending of CORS headers; Useful when you only want to enable CORS for specific URLs, e. g. for a REST API under
/api/.
Example:
CORS_URLS_REGEX = r'^/api/.*$'
Default:
CORS_URLS_REGEX = '^.*$'
CORS_ALLOW_METHODS: specify the allowed HTTP methods that can be used when making the actual request
Default:
CORS_ALLOW_METHODS = (
'GET',
'POST',
'PUT',
'PATCH',
'DELETE',
'OPTIONS'
)
CORS_ALLOW_HEADERS: specify which non-standard HTTP headers can be used when making the actual request
Default:
CORS_ALLOW_HEADERS = (
'x-requested-with',
'content-type',
'accept',
'origin',
'authorization',
'x-csrftoken'
)
CORS_EXPOSE_HEADERS: specify which HTTP headers are to be exposed to the browser
Default:
CORS_EXPOSE_HEADERS = ()
CORS_PREFLIGHT_MAX_AGE: specify the number of seconds a client/browser can cache the preflight response
Note: A preflight request is an extra request that is made when making a "not-so-simple" request (eg. content-type is not application/x-www-form-urlencoded) to determine what requests the server actually accepts. Read more about it here: [http://www.html5rocks.com/en/tutorials/cors/](http://www.html5rocks.com/en/tutorials/cors/)
Default:
CORS_PREFLIGHT_MAX_AGE = 86400
CORS_ALLOW_CREDENTIALS: specify whether or not cookies are allowed to be included in cross-site HTTP requests (CORS).
Default:
CORS_ALLOW_CREDENTIALS = False
CORS_REPLACE_HTTPS_REFERER: specify whether to replace the HTTP_REFERER header if CORS checks pass so that CSRF django middleware checks will work with https
Note: With this feature enabled, you also need to add the corsheaders.middleware.CorsPostCsrfMiddleware after django.middleware.csrf.CsrfViewMiddleware to undo the header replacement
Default:
CORS_REPLACE_HTTPS_REFERER = False
v0.13 and onwards - Release Notes
v0.12 - Added an option to selectively enable CORS only for specific URLs
v0.11 - Added the ability to specify a regex for whitelisting many origin hostnames at once
v0.10 - Introduced port distinction for origin checking; use urlparse for Python 3 support; added testcases to project
v0.06 - Add support for exposed response headers
v0.05 - fixed middleware to ensure correct response for CORS preflight requests
v0.04 - add Access-Control-Allow-Credentials control to simple requests
v0.03 - bugfix (repair mismatched default variable names)
v0.02 - refactor/pull defaults into separate file
v0.01 - initial release
A shoutout to everyone who has contributed: