Drop-in replacement for iOS 5’s [NSURLConnection sendAsynchronousRequest:queue:completionHandler:] method for iOS 4.x (and earlier).
Will use the built-in method on iOS and falls back to the custom implementation if sendAsynchronousRequest is not available.
#import "NSURLConnection+Compatibility.h"
...
[NSURLConnection as_sendAsynchronousRequest:request queue:_operationQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
...
}];