Question

我正在AWS EC2实例（Ubuntu）上测试我的Flask应用。

主要应用：

from sonip.api.factory import create_app
app = create_app()
def main():
    app.run(debug=True, threaded=True)
if __name__ == "__main__":
    main()

Flask应用程序的实际设置是在工厂完成的，包括注册blueprint等。

def create_app():
    app = Flask(__name__)
    app.config['SERVER_NAME'] = settings.FLASK_SERVER_NAME
    app.config['SWAGGER_UI_DOC_EXPANSION'] = settings.RESTPLUS_SWAGGER_UI_DOC_EXPANSION
    app.config['RESTPLUS_VALIDATE'] = settings.RESTPLUS_VALIDATE
    app.config['RESTPLUS_MASK_SWAGGER'] = settings.RESTPLUS_MASK_SWAGGER
    app.config['ERROR_404_HELP'] = settings.RESTPLUS_ERROR_404_HELP
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

    app.config["SQLALCHEMY_DATABASE_URI"] = "postgresql://{}:{}@{}:{}/{}".format(
        settings.DB_USER,
        settings.DB_PASS,
        settings.DB_HOST,
        settings.DB_PORT,
        settings.DB_NAME)
    db.init_app(app)
    blueprint = Blueprint('api', __name__, url_prefix='/api')
    app.register_blueprint(blueprint)

    return app

当我运行python application.py并使用curl -X GET http://localhost:5000/api时，它会返回正确的Swagger页面。但是，如果我尝试通过为外部流量指定host=0.0.0.0来运行应用程序，那么我会为同一请求获得404。

(env) ubuntu@ip-172-31-18-136:~/aae$ python application.py
 * Serving Flask app "sonip.api.factory" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://localhost:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 948-062-124
127.0.0.1 - - [16/May/2018 18:07:24] "GET /api/ HTTP/1.1" 200 -
♥(env) ubuntu@ip-172-31-18-136:~/aae$ vi application.py
(env) ubuntu@ip-172-31-18-136:~/aae$ python application.py
 * Serving Flask app "sonip.api.factory" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 948-062-124
165.225.34.185 - - [16/May/2018 18:08:28] "GET /api/ HTTP/1.1" 404 -

端口5000已打开，允许安全组中的所有入站流量。我尝试了一个只有几行代码的vanilla Flask应用程序，它运行得很好。

app = Flask(__name__)
if __name__ == '__main__':
    app.run(debug=True, port=8080, host='0.0.0.0')

这至少意味着5000是好的。可能是Blueprint还是Swagger？

Answer 1

设置SERVER_NAME并将主机/端口更改为app.run()中不同的东西，以前是问题的处方。充其量，它的记录不足。

尝试将settings.FLASK_SERVER_NAME更改为0.0.0.0:5000。或者，如果您的应用想要使用Cookie，请尝试使用something.dev:5000并将something.dev条目添加到您当地的/etc/hosts。

为什么在0.0.0.0上运行Flask app时会得到404

1 个答案: