Aliyun Linux writes Python flask, unable to access public IP via browser

The problems that arise are:

Wrote a. Py program based on the output HelloWorld of the flask Framework, which was written on the Aliyun server, based on the Ubuntu operating system.

The code is written like this:

However, when the browser is accessed, it cannot be accessed, and the result is this:

Solve:

Add your private IP to App.run () and the port, where: The port is open in your security policy group.

Direction is in the direction

Results:

Enter IP in the browser:

Reference Blog: 78720506

Aliyun Linux writes Python flask, unable to access public IP via browser