[#141] Add well-known attribute for content type

Neo3 Oracles need a way to check object's MIME content type, as described in neo-project/neo-modules#555. The proposal was to add Content-Type as a well-known attribute. Signed-off-by: Stanislav Bogatyrev <stanislav@nspcc.ru>
nspcc-dev · Mar 15, 2021 · e33f784 · e33f784
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diff --git a/object/types.proto b/object/types.proto
@@ -124,6 +124,8 @@ message Header {
   //   File name to be associated with the object on saving
   // * Timestamp \
   //   User-defined local time of object creation in Unix Timestamp format
+  // * Content-Type \
+  //   MIME Content Type of object's payload
   //
   // For detailed description of each well-known attribute please see the
   // corresponding section in NeoFS Technical specification.

diff --git a/proto-docs/object.md b/proto-docs/object.md
@@ -699,6 +699,8 @@ And some well-known attributes used by applications only:
   File name to be associated with the object on saving
 * Timestamp \
   User-defined local time of object creation in Unix Timestamp format
+* Content-Type \
+  MIME Content Type of object's payload
 
 For detailed description of each well-known attribute please see the
 corresponding section in NeoFS Technical specification.