How to use the NSURLRequestReloadRevalidatingCacheData cache policy

Question

These links mention

that NSURLRequestReloadRevalidatingCacheData is not yet implemented in ios7.

Is this implemented in iOS 11?

If so, can you tell me how to use it?

If not, what are the alternatives / guidelines for checking the cache on the server before using it?

Thank!

+3

Ted May 12 '15 @ 4:35 am

1 answer

wyszo · Accepted Answer · 2015-10-20T07:02:34+0000

NSURLRequestReloadRevalidatingCacheData (ReloadRevalidatingCacheData in Swift) is still not implemented in iOS9.

You can manually implement this behavior by sending a HEAD network request and checking the last modified date. Here's how to do it: iOS - Download file only if modified (NSURL and NSData)