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from functools import wraps
from asgiref.sync import iscoroutinefunction
from django.utils.cache import patch_vary_headers
def vary_on_headers(*headers):
"""
A view decorator that adds the specified headers to the Vary header of the
response. Usage:
@vary_on_headers('Cookie', 'Accept-language')
def index(request):
...
Note that the header names are not case-sensitive.
"""
def decorator(func):
if iscoroutinefunction(func):
async def _view_wrapper(request, *args, **kwargs):
response = await func(request, *args, **kwargs)
patch_vary_headers(response, headers)
return response
else:
def _view_wrapper(request, *args, **kwargs):
response = func(request, *args, **kwargs)
patch_vary_headers(response, headers)
return response
return wraps(func)(_view_wrapper)
return decorator
vary_on_cookie = vary_on_headers("Cookie")
vary_on_cookie.__doc__ = (
'A view decorator that adds "Cookie" to the Vary header of a response. This '
"indicates that a page's contents depends on cookies."
)
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