**Description**

Enabled list of cors headers origin allowed

**Use case / motivation**

I'm currently developping Django application working with apache airflow for some external work through api. From Django, user run dag and a js request wait for dag end. By this way, I enabled cors headers in airflow.cfg with correct url. But now, I've  environment (dev & prod). It could be useful to be able to set more than one url in airflow.cfg cors header origin allowed

Thank's in advance :) 

airflow/www/extensions/init_views.py
"""Initialize Stable API"""
    base_path = '/api/v1'
    from airflow.www import views
    @app.errorhandler(404)
    @app.errorhandler(405)
    def _handle_api_error(ex):
        if request.path.startswith(base_path):
            
            
            
            
            return common_error_handler(ex)
        else:
            return views.not_found(ex)
    spec_dir = path.join(ROOT_APP_DIR, 'api_connexion', 'openapi')
    connexion_app = connexion.App(__name__, specification_dir=spec_dir, skip_error_handlers=True)
    connexion_app.app = app
    api_bp = connexion_app.add_api(
        specification='v1.yaml', base_path=base_path, validate_responses=True, strict_validation=True
    ).blueprint
    
    
    app.after_request_funcs.setdefault(api_bp.name, []).append(set_cors_headers_on_response)
    app.register_error_handler(ProblemException, common_error_handler)
    app.extensions['csrf'].exempt(api_bp)
def init_api_experimental(app):