Only can see the directory structure rather than the real html page.

I followed the link:

created my first webpage in flask using the following code:

from flask import Flask
app = Flask(__name__)
def hello():
    return "Hello, I love Digital Ocean!"

if __name__ == "__main__":

But I could not see this page when type droplet ID address in browser. It only showed the directory structure.

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You need to make sure that you have the wsgi apache module enabled with this command:

sudo a2enmod wsgi 

Also you need to have a similar Apache Vhost:

<VirtualHost *:80>
		WSGIScriptAlias / /var/www/FlaskApp/flaskapp.wsgi
		<Directory /var/www/FlaskApp/FlaskApp/>
			Order allow,deny
			Allow from all
		Alias /static /var/www/FlaskApp/FlaskApp/static
		<Directory /var/www/FlaskApp/FlaskApp/static/>
			Order allow,deny
			Allow from all
		ErrorLog ${APACHE_LOG_DIR}/error.log
		LogLevel warn
		CustomLog ${APACHE_LOG_DIR}/access.log combined

Without the extra rules, your script would not be executed.

Regards, Bobby