class Restforce::Middleware::Multipart

def call(env)
  match_content_type(env) do |params|
    env[:request] ||= {}
    env[:request][:boundary] ||= DEFAULT_BOUNDARY
    env[:request_headers][CONTENT_TYPE] += ";boundary=#{env[:request][:boundary]}"
    env[:body] = create_multipart(env, params)
  end
  @app.call env
end