add comment about json parameter changing content-type
@@ -283,6 +283,8 @@ the ``json`` parameter (added in version 2.4.2) and it will be encoded automatic
Note, the ``json`` parameter is ignored if either ``data`` or ``files`` is passed.
+Using the ``json`` parameter in the request will change the ``Content-Type`` in the header to ``application/json``.
+
POST a Multipart-Encoded File
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