Configure Flask dev server to be visible across th

Question

I'm not sure if this is Flask specific, but when I run an app in dev mode (http://localhost:5000), I cannot access it from other machines on the network (with http://[dev-host-ip]:5000). With Rails in dev mode, for example, it works fine. I couldn't find any docs regarding the Flask dev server configuration. Any idea what should be configured to enable this?

Answer 1

I had the same problem, I use PyCharm as an editor and when I created the project, PyCharm created a Flask Server. What I did was create a server with Python in the following way;

basically what I did was create a new server but flask if not python

I hope it helps you

Answer 2

While this is possible, you should not use the Flask dev server in production. The Flask dev server is not designed to be particularly secure, stable, or efficient. See the docs on deploying for correct solutions.

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Add a parameter to your app.run(). By default it runs on localhost, change it to app.run(host= '0.0.0.0') to run on your machines IP address.

Documented on the Flask site under "Externally Visible Server" on the Quickstart page:

Externally Visible Server

If you run the server you will notice that the server is only available from your own computer, not from any other in the network. This is the default because in debugging mode a user of the application can execute arbitrary Python code on your computer. If you have debug disabled or trust the users on your network, you can make the server publicly available.

Just change the call of the run() method to look like this:

app.run(host='0.0.0.0')

This tells your operating system to listen on a public IP.

Answer 3

If you use the flask executable to start your server, you can use flask run --host=0.0.0.0 to change the default from 127.0.0.1 and open it up to non local connections. The config and app.run methods that the other answers describe are probably better practice but this can be handy as well.

Externally Visible Server If you run the server you will notice that the server is only accessible from your own computer, not from any other in the network. This is the default because in debugging mode a user of the application can execute arbitrary Python code on your computer.

If you have the debugger disabled or trust the users on your network, you can make the server publicly available simply by adding --host=0.0.0.0 to the command line:

flask run --host=0.0.0.0 This tells your operating system to listen on all public IPs.

Reference: http://flask.pocoo.org/docs/0.11/quickstart/

Answer 4

Adding to @Shawn's answer, there is also a builtin configuration variable SERVER_NAME. we can set that to 0.0.0.0 in the config file which you specify in app.config.from_pyfile("config.py"). Also note that, this will override app.run host name.
Reference: http://flask.pocoo.org/docs/0.10/config/

Answer 5

Check whether the particular port is open on the server to serve the client or not?

in Ubuntu or Linux distro

sudo ufw enable
sudo ufw allow 5000/tcp //allow the server to handle the request on port 5000

Configure the application to handle remote requests

app.run(host='0.0.0.0' , port=5000)


python3 app.py & #run application in background

Answer 6

Add below lines to your project

if __name__ == '__main__':
    app.debug = True
    app.run(host = '0.0.0.0',port=5005)