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Docs: clarify JSON request Content-Type requirement

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G 2026-01-31 17:34:18 +05:30
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docs/quickstart.rst
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@ -709,6 +709,11 @@ This is a shortcut to passing the data to the
:func:`~flask.json.jsonify` function, which will serialize any supported :func:`~flask.json.jsonify` function, which will serialize any supported
JSON data type. That means that all the data in the dict or list must be JSON data type. That means that all the data in the dict or list must be
JSON serializable. JSON serializable.
.. note::
When sending JSON requests, clients must include the
``Content-Type: application/json`` header.
Otherwise, ``request.get_json()`` may return ``None``.
For complex types such as database models, you'll want to use a For complex types such as database models, you'll want to use a
serialization library to convert the data to valid JSON types first. serialization library to convert the data to valid JSON types first.