title: how to send http request from non ui thread in ios
body: <p>I am looking for a sample to send and receive http GET request in iOS. All I want to
  do is handle communication in background thread such that it does not block main thread
  and also want to handle http standard error code. Can anyone suggest me reference code or
  example to handle http response data and handle proper memory management?</p>
  
  <p>Any help will be thankful.</p>