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    <p>If the question is how to log in to your server, the implementation details will differ a little based upon how your server authenticates a "login". One model is a simple HTTP POST. The other model is <a href="http://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/URLLoadingSystem/Articles/AuthenticationChallenges.html#//apple_ref/doc/uid/TP40009507-SW1" rel="nofollow noreferrer">authentication challenges</a> as discussed in the <em>URL Loading System Programming Guide.</em> </p> <p>If you don't know which style your web server has employed, you can generally figure it out if you try to access one of the secured files using a URL from your web browser. Your server is employing authentication challenges if you see a screen like this:</p> <p><img src="https://i.stack.imgur.com/cJOgW.png" alt="authentication challenge"></p> <p>If you don't see a web browser generated pop-up, but rather see something like a HTML "please log in" message, then you probably have to do the POST login process. Note, if your server is using this sort of process, if the success or failure of the login is reported via an HTML page, having your app decipher that is a little bit of a hassle. If would be ideal if you had a version of the login page that provided a JSON or XML response, instead of a HTML response. I don't know if you have the latitude to do that on your server, but it will greatly simply your iOS development if you could do it that way.</p> <p>If you're logging in doing a POST, see the <a href="http://developer.apple.com/library/ios/samplecode/SimpleURLConnections/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009245" rel="nofollow noreferrer">SimpleURLConnections sample app</a> for demonstrations on how to make simple POST (and GET) requests of your web server.</p> <p>See the <a href="http://developer.apple.com/library/ios/samplecode/AdvancedURLConnections/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009558" rel="nofollow noreferrer">AdvancedURLConnections sample app</a> for examples of how to handle authentication challenges.</p>
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    1. POiOS website interaction (NSURLConnection) design/pattern
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    1. COThanks Rob, your answer is helpful but... it was not a question of how to implement the specific authentication methods. I'd like to know how to use NSUrlConnection in a clean scalable way. I'll have a look at the examples you've provided for tips and pointers.
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    2. CO@DIJ If you're digging through source code for inspiration, I might also suggest you consider looking through the code for [`AFNetworking`](https://github.com/AFNetworking/AFNetworking) or [`RestKit`](http://restkit.org) (which itself, is built upon `AFNetworking`), too. These leverage `NSURLConnection` functionality, while providing some valuable abstractions. It might be up your alley.
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