the last command is a blank string (actually a LF). the request must include a Host:Port keyword. the remote file must include a full path name and be followed by a protocol, which is HTTP 1.1 in this example. 
the GET request is sent as text by using printf. In the following example, I open a socket to the mission website for NASA’s Solar Dynamics Observatory and send a GET request for a JPEG image of the Sun at. Get_lun = keyword to request a logical unit number. 
The socket command syntax is: socket,unit,host,port,/get_lun In this post, I will demonstrate how to use the socket procedure to download a file by sending an HTTP GET request. The IDL socket procedure is a powerful tool for connecting to and accessing content on remote servers.
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