Host matching with Flask

create_app.py

def create_app():
    """Factory for the application."""
    config_name = os.getenv('FLASK_ENV', 'production')
    app = Flask(
        'lemonade_soapbox',
        static_folder='assets',
        static_host=os.getenv('MAIN_HOST'),
        host_matching=True,
    )
    
    # Lots of standard app setup things here

    from lemonade_soapbox.views import admin, api, blog, frontend, reviews

    # Register admin and API blueprints on both domains so we can log in to both
    app.register_blueprint(admin.bp, host=os.getenv('MAIN_HOST'), url_prefix='/meta')
    app.register_blueprint(api.bp, host=os.getenv('MAIN_HOST'), url_prefix='/api')
    app.register_blueprint(blog.bp, host=os.getenv('MAIN_HOST'), url_prefix='/blog')
    app.register_blueprint(frontend.bp, host=os.getenv('MAIN_HOST'), url_prefix='/')

    app.register_blueprint(admin.bp, host=os.getenv('REVIEW_HOST'), url_prefix='/meta')
    app.register_blueprint(api.bp, host=os.getenv('REVIEW_HOST'), url_prefix='/api')
    app.register_blueprint(reviews.bp, host=os.getenv('REVIEW_HOST'), url_prefix='/')