Send an HTTP GET request to the newton API
    operation: one of the API endpoints
    expression: the str for the given endpoint to evaluate

def send_request (operation, expression):
    """
    Send an HTTP GET request to the newton API
    operation: one of the API endpoints
    expression: the str for the given endpoint to evaluate
    """
    
    base = 'https://newton.now.sh'
    url = '%s/%s/%s' % (base, operation, urllib.parse.quote(expression))
    
    with urllib.request.urlopen(url) as response:
        return handle_response(response)