I could be wrong, but as of iOS5, NSURLConnection does disk caching by default, ...

jazzychad · on July 13, 2012

Yes, There is disk caching for NSURLConnection by default, but in my experience it does not cache it across app restarts, so each time the app starts again all the images have to be fetched all over again... SDWebImage gives the persistent disk caching I want.

If I'm misunderstanding what's happening please let me know...

matttthompson · on July 13, 2012

NSURLCache does disk caching in iOS 5 and up, but only for http (no https) requests. Use SDURLCache if you want more options there.