I tried multipart-upload-api with Ruby. Sample code is as the follows:

multipart_upload.rb

require 'aws-sdk'

Endpoint = "localhost"
Port = 8080

class LeoFSHandler < AWS::Core::Http::NetHttpHandler
  def handle(request, response)
    request.port = ::Port
    super
  end
end

AWS.config(
  :access_key_id => '05236',
  :secret_access_key => '802562235',
  s3_endpoint: Endpoint,
  http_handler: LeoFSHandler.new, 
  s3_force_path_style: true,
  use_ssl: false
)

file_path_for_multipart_upload = 'test-large-file.tar.gz'

bucket = AWS::S3.new.buckets['photo']

open(file_path_for_multipart_upload) do |file|
  uploading_object = bucket.objects[File.basename(file.path)]
  uploading_object.multipart_upload do |upload|
    while !file.eof?
      # upload.add_part(file.read 5242880)  ##  5242880 :  5MB
      upload.add_part(file.read 15728640) ## 15728640 : 15MB
      p('Aborted') if upload.aborted?
    end
  end
end

• gateway/etc/app.config

  {leo_gateway, [
                 %% == Gateway Properties ==
                 {listener, leo_s3_http},
                 {layer_of_dirs, {1, 12} },
  
                 {s3_http, [
                            %% Use S3-API ?
                            {s3_api, true},
  
                            %% HTTP-Server: [cowboy]
                            {http_server, cowboy},
  
                            %% Gateway's port number
                            {port, 8080 },
  
                            %% # of acceptors
                            {num_of_acceptors, 128 },
  
                            %% == ssl related ==
                            {ssl_port,     8443 },
                            {ssl_certfile, "./etc/server_cert.pem" },
                            {ssl_keyfile,  "./etc/server_key.pem" },
  
                            %% == large-object related ==
                            {max_chunked_objs,      1000  }, ##  a number of  maximum chunked objects ##
                            {max_len_for_obj,       524288000   },
                            {chunked_obj_len,       5242880   },
                            {threshold_obj_len,     5767168 },
                            .
                            .
                            .
  

• s3cmd

  $ s3cmd ls s3://photo
  2012-12-17 12:27 156286259   s3://photo/test-large-file.tar.gz
  

• Curl command's result:

  $ curl -X GET http://photo.localhost:8080/test-large-file.tar.gz > new-test-large-file.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  100  149M    0  149M    0     0  45.0M      0 --:--:--  0:00:03 --:--:-- 45.0M