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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def OPTIONS_preflight( self, path_info ):
 """ Give back CORS preflight check headers """

        self.send_response(200)
        self.send_header('Access-Control-Allow-Origin', '*')    # CORS
        self.send_header('Access-Control-Allow-Methods', 'GET, PUT, POST, DELETE')
        self.send_header('Access-Control-Allow-Headers', 'content-type, authorization, range')
        self.send_header('Access-Control-Expose-Headers', 'content-length, content-range')
        self.send_header('Access-Control-Max-Age', 21600)
        self.end_headers()
        return