Flask get server host

Flask get server host
How to get Flask server host address?
The flask python app host can be accessed (during a request) by running:
# Or the full url:

For more info read about app_context on the official Flask docs.

But wait, did you know you can also use url_for?

url_for allows you to pass _external=True which will return a complete url with scheme (e.g. https://) and the hostname (e.g. example.com):

url_for('hello_world', _external=True)

Would return something like: https://example.com/, which includes the server hostname.

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