From 280e0aaee85413d208a57133562d372e592f9df8 Mon Sep 17 00:00:00 2001
From: G <g.anusha@siemens.com>
Date: Sat, 31 Jan 2026 17:34:18 +0530
Subject: [PATCH] Docs: clarify JSON request Content-Type requirement

---
 docs/quickstart.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/quickstart.rst b/docs/quickstart.rst
index 6af09eb648..2747d0414a 100644
--- a/docs/quickstart.rst
+++ b/docs/quickstart.rst
@@ -709,6 +709,11 @@ This is a shortcut to passing the data to the
 :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 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
 serialization library to convert the data to valid JSON types first.