Ruby mechanize excerpt

gistfile1.rb

  def request uri, req = nil, &block
    retried      = false
    bad_response = false

    req = request_setup req || uri

    connection = connection_for uri
    connection_id = connection.object_id

    begin
      Thread.current[@request_key][connection_id] += 1
      response = connection.request req, &block

      if connection_close?(req) or
         (response.http_version <= '1.0' and
          not connection_keep_alive?(response)) or
         connection_close?(response) then
        connection.finish
      end
    rescue Net::HTTPBadResponse => e
      message = error_message connection

      finish connection

      raise Error, "too many bad responses #{message}" if
        bad_response or not can_retry? req

      bad_response = true
      retry
    rescue *RETRIED_EXCEPTIONS => e # retried on ruby 2
      request_failed e, req, connection if
        retried or not can_retry? req, @retried_on_ruby_2

      reset connection

      retried = true
      retry
    rescue Errno::EINVAL, Errno::ETIMEDOUT => e # not retried on ruby 2
      request_failed e, req, connection if retried or not can_retry? req

      reset connection

      retried = true
      retry
    rescue Exception => e
      finish connection

      raise
    ensure
      Thread.current[@timeout_key][connection_id] = Time.now
    end

    @http_versions["#{uri.host}:#{uri.port}"] ||= response.http_version

    response
  end

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