# Django 4.2.11 documentation

# Source code for django.views.decorators.cache

    from functools import wraps

    from django.middleware.cache import CacheMiddleware
    from django.utils.cache import add_never_cache_headers, patch_cache_control
    from django.utils.decorators import decorator_from_middleware_with_args

    def cache_page(timeout, *, cache=None, key_prefix=None):
        """
        Decorator for views that tries getting the page from the cache and
        populates the cache if the page isn't in the cache yet.

        The cache is keyed by the URL and some data from the headers.
        Additionally there is the key prefix that is used to distinguish different
        cache areas in a multi-site setup. You could use the
        get_current_site().domain, for example, as that is unique across a Django
        project.

        Additionally, all headers from the response's Vary header will be taken
        into account on caching -- just like the middleware does.
        """
        return decorator_from_middleware_with_args(CacheMiddleware)(
            page_timeout=timeout,
            cache_alias=cache,
            key_prefix=key_prefix,
        )

    def cache_control(**kwargs):
        def _cache_controller(viewfunc):
            @wraps(viewfunc)
            def _cache_controlled(request, *args, **kw):
                # Ensure argument looks like a request.
                if not hasattr(request, "META"):
                    raise TypeError(
                        "cache_control didn't receive an HttpRequest. If you are "
                        "decorating a classmethod, be sure to use "
                        "@method_decorator."
                    )
                response = viewfunc(request, *args, **kw)
                patch_cache_control(response, **kwargs)
                return response

            return _cache_controlled

        return _cache_controller

    def never_cache(view_func):
        """
        Decorator that adds headers to a response so that it will never be cached.
        """

        @wraps(view_func)
        def _wrapper_view_func(request, *args, **kwargs):
            # Ensure argument looks like a request.
            if not hasattr(request, "META"):
                raise TypeError(
                    "never_cache didn't receive an HttpRequest. If you are "
                    "decorating a classmethod, be sure to use @method_decorator."
                )
            response = view_func(request, *args, **kwargs)
            add_never_cache_headers(response)
            return response

        return _wrapper_view_func