Configure Flask dev server to be visible across the network

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

Answer 1

Go to your project path on CMD(command Prompt) and execute the following command:-

set FLASK_APP=ABC.py

SET FLASK_ENV=development

flask run -h [yourIP] -p 8080

you will get following o/p on CMD:-

• Serving Flask app "expirement.py" (lazy loading)
  • Environment: development
  • Debug mode: on
  • Restarting with stat
  • Debugger is active!
  • Debugger PIN: 199-519-700
  • Running on http://[yourIP]:8080/ (Press CTRL+C to quit)

Now you can access your flask app on another machine using http://[yourIP]:8080/ url

Answer 2

You can also set the host (to expose it on a network facing IP address) and port via environment variables.

$ export FLASK_APP=app.py
$ export FLASK_ENV=development
$ export FLASK_RUN_PORT=8000
$ export FLASK_RUN_HOST=0.0.0.0

$ flask run
 * Serving Flask app "app.py" (lazy loading)
 * Environment: development
 * Debug mode: on
 * Running on https://0.0.0.0:8000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 329-665-000

See How to get all available Command Options to set environment variables?