http.rb

def HTTP.get_truncated_response(uri_or_host, path = nil, port = nil, &block)
  range = { 'Range' => "bytes=0-1000"}
  if path
    host = uri_or_host
    new(host, port || HTTP.default_port).start {|http|
      return http.request_get(path, range, &block)
    }
  else
    uri = uri_or_host
    new(uri.host, uri.port).start {|http|
      return http.request_get(uri.request_uri, range, &block)
    }
  end
end