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Send a GET http request to a specific url. This is asynchronous. When server responds, the callback is fired, with following arguments.

• connection
• user parameter
• data parameter : depends on the following parameter
• state code :
  

  0	some data has been received, and can be read in the received data parameter
  1	end of request. received data is nil. This is the last call of the callback.
  other	an error occured during the request. received data is nil. This is the last call of the callback

INET INETGetURL ( Chn _channel_ S _url_ I _mode_ fun [INET u0 S I] u1 _callback_ u0 _user_ )

_channel_
	any channel
_url_
	url
_mode_
	should be 0
_callback_
	callback function, called when data is retrieved from server.
_user_
	user parameter