Как записать заголовок http referer в переменную?

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from flask import Flask, request

app = Flask(__name__)

@app.route('/example', methods=['GET'])
def example():
    referer = request.headers.get('Referer')
    return referer

if __name__ == '__main__':
    app.run()

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$referer = $_SERVER['HTTP_REFERER'];

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var referrer = document.referrer;

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import javax.servlet.http.HttpServletRequest;

String referer = request.getHeader("Referer");

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referer = request.headers["Referer"]

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app.get('/example', (req, res) => {
  const referer = req.get('Referer');
  res.send(referer);
});

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$referer = $_SERVER['HTTP_REFERER'];