class Seahorse::Client::Plugins::ContentLength::Handler

def call(context)
  # If it's an IO object and not a File / String / String IO
  if context.http_request.body.respond_to?(:size)
    length = context.http_request.body.size
    context.http_request.headers['Content-Length'] = length
  end
  @handler.call(context)
end