使用Cocoa Touch的两个异步NSURLRequests

I am using the example shown here - listing's 1-5 to request the content of a URL and everything is working perfectly. Now my problem is, while the first request is sent off, I want to request content from a second web page, my problem is, even if I duplicate everything there for a second request and connection, and create another variable for NSMutableData that should hold the second request's data, I am only getting the second requests data filled into *receivedData (i.e. the original first requests NSMutableData) - listing's 1