`ipfs object get --encoding=protobuf`HTTP response returns wrong content type

[RichardLitt]

$ curl -i -X POST "http://localhost:5001/api/v0/object/get?arg=QmW2WQi7j6c7UgJTarActp7tDNikE4B2qXtFCfLPdsgaTQ&encoding=protobuf"
HTTP/1.1 200 OK
Access-Control-Allow-Headers: X-Stream-Output, X-Chunked-Output
Access-Control-Expose-Headers: X-Stream-Output, X-Chunked-Output
Content-Type: application/json
Server: go-ipfs/0.4.0-dev
Trailer: X-Stream-Error
Transfer-Encoding: chunked
Date: Tue, 15 Mar 2016 17:11:30 GMT
Transfer-Encoding: chunked

1
" ? :?^?E???p??\?|?.??t|d??U??cat.jpg?

The Content-Type should be application/protobuf, not application/json.

[RichardLitt]

This should be fixed before merging ipfs-inactive/http-api-spec#32.

[RichardLitt]

Blocking ipfs-inactive/http-api-spec#67.