Objective-C async http request

I want to create an async http request. Where to start? Can you give me some good links to start t开发者_如何学Gohis? I want to learn it.

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-[NSURLConnection initWithRequest:delegate:]

See Using NSURLConnection from Apple.

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http://cocoawithlove.com/2008/09/cocoa-application-driven-by-http-data.html

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You can use third party SDK like ASIHTTPRequest . It is very simple to use and come with some delegate methods. This is how you can use it. It is really useful as it provide a lot of features.