UIWebView caching failure for iOS>5.0

[kremizask]

When the fallback to NSURLCache happens (iOS>5.0) caching for UIWebViews does not work. I assume it is because NSCachedURLResponse coming from an UIWebView has a storagePolicy set to NSURLCacheStorageAllowedInMemoryOnly as discussed here: #1 .

[rs]

I tested on iOS 5.1.1 on both device and simulator, and NSURLCacheStorageAllowed seems to be used for all UIWebView cache requests. How do you reproduce the issue?

[kremizask]

I am testing on iOS 5.1 on device/simulator. I have a simple View Controller with a UIWebView. I first run the app with an internet connection and the response is being cached. Then I run the app without an internet connection and the UIWebView does not load the html response. The webView delegate method webView:didFailLoadWithError: is being called with error'The Internet connection appears to be offline.'

I have set the cache-control:max-age header. However, when I do the same tests using the iOS 4.3 simulator, the UIWebView presents the html response both in online and offline mode.

[rs]

Just performed the very same test, worked well with iOS 5. I used this URL: http://rs.rhapsodyk.net/test/cache.html. Here is the test app: http://dl.dropbox.com/u/123346/SDURLCacheTest.zip.

[kremizask]

Interesting... I if I change your url with mine it doesn't work so it must have something to do with the response headers. Since I am not allowed to give you the actual url so that you can see for your self, could you please take a look at the response headers and tell me if you can think of anything? http://dl.dropbox.com/u/16899725/headers.png .

The funny thing is that as I mentioned before, it works with iOS 4.3, meaning it works with SDURLCache.

[rs]

You may try to add Last-Modified header.