Cannot use protobuf codec with http input

[PhilippHomann]

When using http input combined with protobuf codec I receive following error:
[WARN ][logstash.codecs.protobuf ] Couldn't decode protobuf: #<ProtocolBuffers::DecodeError: too many bytes when decoding varint>.
with other proto
Couldn't decode protobuf: #<ProtocolBuffers::DecodeError: invalid message>

Tested with the very basic unicorn.proto from here, I receive error message above when using the protobuf codec with http input.
With tcp input everything works fine.

tcp.conf:

input {
	tcp {
		port => 5000
		codec => protobuf
		{
		    class_name => "Animal::Unicorn"
                    include_path => ["/unicorn.pb.pb.rb"]
		}
	}
}
output { stdout { } }

http.conf:

input {
	http {
		port => 5000
		codec => protobuf
		{
		    class_name => "Animal::Unicorn"
                    include_path => ["/unicorn.pb.pb.rb"]
		}
	}
}
output { stdout { } }

unicorn.pb.pb.rb:

#!/usr/bin/env ruby
# Generated by the protocol buffer compiler. DO NOT EDIT!

require 'protocol_buffers'

module Animal
  # forward declarations
  class Unicorn < ::ProtocolBuffers::Message; end

  class Unicorn < ::ProtocolBuffers::Message
    set_fully_qualified_name "Animal.Unicorn"

    optional :string, :colour, 1
    optional :int32, :horn_length, 2
    optional :int64, :last_seen, 3
  end

end

unicorn.bin (base64):

Cg5yZWQtYmx1ZS13aGl0ZRD///////////8BGAA=

Input to logstash is done by:

curl -XPOST --data-binary @unicorn.bin http://127.0.0.1:5000
nc 127.0.0.1 5000 < unicorn.bin

[jvmlet]

Don't you need to base64-decode first ?

[PhilippHomann]

I base64 encoded the binary file to paste it here ;-)
Not send the base64 encoded data to logstash.

[jvmlet]

How do you send then byte[] over http ? Charset ,Content-Type ?
Can you add the file output to your pipeline without codec and compare the binaries ?