code: def send_async(self, callback, strict_validation=True):
          
          def target():
              try:
                  response = self.send(strict_validation)
                  callback(response=response)
              except Exception as e:
                  callback(error=e)
          threading.Thread(target=target).start()
docs: Same as send() but in a non-blocking way.
          
          Use this method if you want to send the request asynchronously so your 
          program can do other things while waiting for the response.
          
          `callback` is a function (or other callable) with the following 
          signature:
          callback(response=None, error=None)
          
          Example:
          
          >>> from osrframework.thirdparties.pipl_com.lib.search import SearchAPIRequest
          >>>
          >>> def my_callback(response=None, error=None):
          ...     print response or error
          ...
          >>> request = SearchAPIRequest('samplekey', email='eric@cartman.com')
          >>> request.send_async(my_callback)
          >>> do_other_things()