First commit

.gitignore

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+.idea/

app.py

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+import flask as f
+
+app = f.Flask(__name__)
+
+
+@app.route("/")
+def root_page():
+    return '<a href="/referer">Click on me!</a>'
+
+
+@app.route('/referer')
+def referer_page():
+    referer = f.request.headers.get("Referer")
+    if referer:
+        return f"Referer: {referer}"
+    else:
+        return "No Referer header was sent."
+
+
+if __name__ == '__main__':
+    app.run()