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   1 # http\Client http\Client::attach(SplObserver $observer)
   2
   3 Implements SplSubject. Attach another observer.
   4 Attached observers will be notified with progress of each transfer.
   5
   6 ## Params:
   7
   8 * SplObserver $observer
   9   An implementation of SplObserver.
  10
  11 ## Returns:
  12
  13 * http\Client, self.
  14
  15 ## Throws:
  16
  17 * http\Exception\InvalidArgumentException
  18 * http\Exception\UnexpectedValueException