ETag and If-None-Match HTTP Headers are not working

Question

I have a file in my webserver and I am downloading that to my app everytime I access it because its possible that file content might be changed But If it is changed I w

Answer 1

I've encountered the same problem. I've discovered that it's because of cachePolicy. You need to set it as follows:

request.cachePolicy = .ReloadIgnoringLocalAndRemoteCacheData

And you will be OK

Answer 2

CachePolicy naming convention is confusing and better yet it actually does not implement some of them...

This article explains them well. http://nshipster.com/nsurlcache/

Also, if you let the Cache Policy to use UseProtocolCachePolicy then your NSURLSession will receive Status code 200 with response generated from Cache.