Use cache data if the origin source can validate it; otherwise, load from the origin.
SDKs
- iOS 2.0+
- macOS 10.5+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
Framework
- Foundation
Declaration
case reloadRevalidatingCacheData = 5
Enumeration CaseNSURLRequest
NSURLRequest
See Also
Policies
case useUse the caching logic defined in the protocol implementation, if any, for a particular URL load request.
case reloadThe URL load should be loaded only from the originating source.
case reloadIgnore local cache data, and instruct proxies and other intermediates to disregard their caches so far as the protocol allows.
case returnUse existing cache data, regardless or age or expiration date, loading from originating source only if there is no cached data.
case returnUse existing cache data, regardless or age or expiration date, and fail if no cached data is available.