Update MessagPack media type

docs/release-notes/whats-new-3.rst

@@ -194,3 +194,13 @@ Removal of deprecated ``litestar.middleware.exceptions`` module and ``ExceptionH
 The deprecated ``litestar.middleware.exceptions`` module and the
 ``ExceptionHandlerMiddleware`` have been removed. Since ``ExceptionHandlerMiddleware``
 has been applied automatically behind the scenes if necessary, no action is required.
+
+
+Update MessagePack media type to ``application/vnd.msgpack``
+------------------------------------------------------------
+
+Change the media type of :attr:`~enums.MediaType.MESSAGEPACK` and
+:attr:`~enums.RequestEncodingType.MESSAGEPACK` from ``application/x-msgpack`` to the
+newly introduced official ``application/vnd.msgpack``.
+
+https://www.iana.org/assignments/media-types/application/vnd.msgpack

litestar/enums.py

@@ -28,7 +28,7 @@ class MediaType(str, Enum):
  """An Enum for ``Content-Type`` header values."""
 
  JSON = "application/json"
- MESSAGEPACK = "application/x-msgpack"
+ MESSAGEPACK = "application/vnd.msgpack"
  HTML = "text/html"
  TEXT = "text/plain"
  CSS = "text/css"
@@ -46,7 +46,7 @@ class RequestEncodingType(str, Enum):
  """An Enum for request ``Content-Type`` header values designating encoding formats."""
 
  JSON = "application/json"
- MESSAGEPACK = "application/x-msgpack"
+ MESSAGEPACK = "application/vnd.msgpack"
  MULTI_PART = "multipart/form-data"
  URL_ENCODED = "application/x-www-form-urlencoded"