### Set Up Local Development Environment for Flask-CORS

Source: https://github.com/corydolphin/flask-cors/blob/main/CONTRIBUTING.md

This snippet outlines the initial steps to set up your local development environment for the `flask-cors` project, including cloning the repository, navigating into the directory, installing dependencies with `uv`, and setting up pre-commit hooks for code quality.

```bash
cd <directory_in_which_repo_should_be_created>
git clone git@github.com:YOUR_NAME/flask-cors.git
```

```bash
cd flask-cors
```

```bash
uv sync
```

```bash
uv run pre-commit install
```

--------------------------------

### Install Flask-CORS using pip

Source: https://github.com/corydolphin/flask-cors/blob/main/README.rst

This snippet demonstrates how to install the Flask-CORS extension using the pip package manager. The `-U` flag ensures that the package is upgraded if it's already installed, providing the latest version.

```bash
$ pip install -U flask-cors
```

--------------------------------

### Install Flask-CORS via pip

Source: https://github.com/corydolphin/flask-cors/blob/main/docs/index.md

This snippet provides the command to install the Flask-CORS extension using pip, a common Python package manager. The `-U` flag ensures that the package is upgraded if already installed.

```console
pip install -U flask-cors
```

--------------------------------

### Enable CORS for all routes with Flask-CORS

Source: https://github.com/corydolphin/flask-cors/blob/main/README.rst

This example shows the simplest way to initialize Flask-CORS. By calling `CORS(app)`, all routes in the Flask application will have CORS enabled by default for all origins and methods. This allows cross-origin AJAX requests to any endpoint without further configuration.

```python
from flask import Flask
from flask_cors import CORS

app = Flask(__name__)
CORS(app)

@app.route("/")
def helloWorld():
  return "Hello, cross-origin-world!"
```

--------------------------------

### Enable CORS with cookie support in Flask-CORS

Source: https://github.com/corydolphin/flask-cors/blob/main/docs/index.md

This Python example shows how to configure Flask-CORS to support credentialed requests, such as those involving cookies. By setting `supports_credentials=True` during `CORS` initialization, cross-origin requests can include credentials, though this requires careful consideration of CSRF protection.

```python
from flask import Flask, session
from flask_cors import CORS

app = Flask(__name__)
CORS(app, supports_credentials=True)

@app.route("/")
def helloWorld():
  return "Hello, %s" % session['username']
```

--------------------------------

### Enable CORS for a single route using decorator

Source: https://github.com/corydolphin/flask-cors/blob/main/README.rst

This example illustrates how to enable CORS for an individual Flask route using the `@cross_origin()` decorator. Placing this decorator below `@app.route()` applies CORS settings specifically to that endpoint, offering fine-grained control over cross-origin access without affecting other routes.

```python
@app.route("/")
@cross_origin()
def helloWorld():
  return "Hello, cross-origin-world!"
```

--------------------------------

### Initialize Flask-CORS for all routes and origins

Source: https://github.com/corydolphin/flask-cors/blob/main/docs/index.md

This Python snippet demonstrates the basic initialization of Flask-CORS. It imports `Flask` and `CORS`, then creates a Flask application instance and applies `CORS(app)` to enable Cross-Origin Resource Sharing for all routes, origins, and methods by default.

```python
from flask import Flask
from flask_cors import CORS

app = Flask(__name__)
CORS(app)

@app.route("/")
def helloWorld():
  return "Hello, cross-origin-world!"
```

--------------------------------

### Manage Local Development Branches and Run Tests

Source: https://github.com/corydolphin/flask-cors/blob/main/CONTRIBUTING.md

This snippet provides commands for creating a new development branch, running formatting checks, executing unit tests, and performing cross-Python version tests using `tox` before submitting a pull request to ensure code quality and compatibility.

```bash
git checkout -b name-of-your-bugfix-or-feature
```

```bash
make check
```

```bash
make test
```

```bash
tox
```

--------------------------------

### Commit and Push Changes to GitHub

Source: https://github.com/corydolphin/flask-cors/blob/main/CONTRIBUTING.md

This snippet details the standard Git workflow for staging, committing, and pushing your local changes to your forked repository on GitHub, preparing them for a pull request.

```bash
git add .
git commit -m "Your detailed description of your changes."
git push origin name-of-your-bugfix-or-feature
```

--------------------------------

### Configure Flask-CORS for specific resources

Source: https://github.com/corydolphin/flask-cors/blob/main/README.rst

This snippet demonstrates how to apply CORS settings to specific resources or URL patterns. By passing a dictionary to the `resources` option of `CORS(app)`, you can define granular CORS policies, such as allowing all origins for paths under `/api/*` while leaving other routes unaffected.

```python
app = Flask(__name__)
cors = CORS(app, resources={r"/api/*": {"origins": "*"}})

@app.route("/api/v1/users")
def list_users():
  return "user example"
```

--------------------------------

### Enable debug logging for Flask-CORS

Source: https://github.com/corydolphin/flask-cors/blob/main/README.rst

This snippet shows how to enable debug logging for the Flask-CORS extension. Setting the logger level to `logging.DEBUG` provides detailed output, which is useful for troubleshooting and understanding the extension's behavior during development, helping to diagnose CORS-related issues.

```python
logging.getLogger('flask_cors').level = logging.DEBUG
```

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