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Editorial Team
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Asked: 2026-06-13T03:24:39+00:00

This question is very similar to this one . However, the accepted answer (and

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This question is very similar to this one.

However, the accepted answer (and the only answer) does not solve my problem.

I have a “hybrid” iOS app containing among other things a UITabView with a set of UIWebViews showing some app content in HTML5 from a web server. Under the hood there is a little home-made cache engine that caches content in the background. This cache engine fills its data using this line

[NSData dataWithContentsOfURL:request.URL options:NSDataReadingUncached error:&error];

So far the app has worked perfectly without any problems, but in iOS 6, it is not working anymore. Using the debugger I have came to conclusion that it is the above line that is not working. When I step accross the above line it just cant load the page, and after a while I get an error 256. When I switch to iOS 5, it works perfectly.

I have printed the NSURL-object request.URL and it looks like it should and it does have the “http://”-part included, like this:

http://app.customername.com/.mvc/MobileApp/Index

I also tried loading a test page that is unrelated to the application website, a very simple html-page that I made myself, and also http://www.google.com

Both of them worked in iOS 5.1 but the same problem occurred with these pages in iOS 6.

I also tried using the method without the “Uncached” option like this, but still no luck: 

[NSData dataWithContentsOfURL:request.URL]

Has something changed in iOS 6 for the method data dataWithContentsOfURL: and has someone else seen this problem?

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1 Answer

  1. Editorial Team

    So, I was having the same exact problem, and I don’t know the exact cause.

    I’m assuming it has something to do with the NSURLCache thread not playing nice with dataWithContentsOfURL. If anybody knows why please chime in.

    Bottom line, I already had ASIHTTP in my project, so I replaced this:

    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];

    With this:

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:url]];
[request startSynchronous];        
NSData *data = [request responseData];

    And now all is well.

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