'Send CORS headers for request_promo requests.'

def OPTIONS_request_promo(self):

    if ('Origin' in request.headers):
        origin = request.headers['Origin']
        response.headers['Access-Control-Allow-Origin'] = '*'
        response.headers['Access-Control-Allow-Methods'] = 'POST'
        response.headers['Access-Control-Allow-Headers'] = 'Authorization,    '
        response.headers['Access-Control-Allow-Credentials'] = 'false'
        response.headers['Access-Control-Expose-Headers'] = self.COMMON_REDDIT_HEADERS
