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copied!<p>Firstly you're making starting the connection too complicated. Change to:</p> <pre><code>connection = [[NSURLConnection alloc] initWithRequest:request delegate:self] </code></pre> <p>Remove <code>[connection start]</code>. Now:</p> <ul> <li>Is your app definitely running the run loop normally? NSURLConnection requires this to work.</li> <li>Are you able to perform a synchronous load of the URL request?</li> <li>In the debugger, can you see that <code>url</code> is what you expect it to be? What is it?</li> <li>Is it possible that you're deallocating WSHelper before any delegate messages are received? NSURLConnection is asynchoronous after all.</li> </ul> <p>One does not need to do anything special to use NSURLConnection, it's a straightforward part of the Foundation framework. No special compiler settings required. No initialization before use. Nothing. Please don't start blindly trying stuff like bringing in CoreServices.Framework.</p> <p>As sending the request synchronously works, there must be something wrong with your handling of the asynchronous aspect. It could be:</p> <ul> <li>The runloop is not running in <code>NSDefaultRunLoopMode</code> so the connection is unable to schedule itself.</li> <li>Some other part of your code is calling <code>-cancel</code> on the connection before it has a chance to load.</li> <li>You are managing to deallocate the connection before it has a chance to load.</li> </ul> <h2>Real problem</h2> <p>Ah, in fact I've just realised what's going on. You are calling:</p> <pre><code>-[NSApp runModalForWindow:] </code></pre> <p><strong>Read the description of what this method does</strong>. It's not running the run loop like <code>NSURLConnection</code> expects. I'd say that really, you don't want to be presenting a window quite like this while running a URL connection for it.</p> <p>I'd also suggest that you implement the <code>-connection:didReceiveResponse:</code> delegate method too. You want to check here that the server is returning the expected status code.</p>

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