3599ac28be
Warn users when Flask's development server is bound to a non-localhost address, which exposes the Werkzeug debugger to the network. The debugger allows arbitrary code execution and should never be exposed on untrusted networks. - Raises RuntimeWarning when host is not 127.0.0.1/localhost/::1 - Raises an additional RuntimeWarning when debug mode is also enabled - Uses warnings.warn() so the warning is visible but doesn't prevent the server from starting (existing behavior preserved) |
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|---|---|---|
| .devcontainer | ||
| .github | ||
| docs | ||
| examples | ||
| src/flask | ||
| tests | ||
| .editorconfig | ||
| .gitignore | ||
| .pre-commit-config.yaml | ||
| .readthedocs.yaml | ||
| CHANGES.rst | ||
| LICENSE.txt | ||
| pyproject.toml | ||
| README.md | ||
| uv.lock | ||
Flask
Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja, and has become one of the most popular Python web application frameworks.
Flask offers suggestions, but doesn't enforce any dependencies or project layout. It is up to the developer to choose the tools and libraries they want to use. There are many extensions provided by the community that make adding new functionality easy.
A Simple Example
# save this as app.py
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello, World!"
$ flask run
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
Donate
The Pallets organization develops and supports Flask and the libraries it uses. In order to grow the community of contributors and users, and allow the maintainers to devote more time to the projects, please donate today.
Contributing
See our detailed contributing documentation for many ways to contribute, including reporting issues, requesting features, asking or answering questions, and making PRs.