connect() private

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# File lib/net/http.rb, line 642
    def connect
      D "opening connection to #{conn_address()}..."
      s = timeout(@open_timeout) { TCPSocket.open(conn_address(), conn_port()) }
      D "opened"
      if use_ssl?
        ssl_parameters = Hash.new
        iv_list = instance_variables
        SSL_ATTRIBUTES.each do |name|
          ivname = "@#{name}".intern
          if iv_list.include?(ivname) and
             value = instance_variable_get(ivname)
            ssl_parameters[name] = value
          end
        end
        @ssl_context = OpenSSL::SSL::SSLContext.new
        @ssl_context.set_params(ssl_parameters)
        s = OpenSSL::SSL::SSLSocket.new(s, @ssl_context)
        s.sync_close = true
      end
      @socket = BufferedIO.new(s)
      @socket.read_timeout = @read_timeout
      @socket.debug_output = @debug_output
      if use_ssl?
        begin
          if proxy?
            @socket.writeline sprintf('CONNECT %s:%s HTTP/%s',
                                      @address, @port, HTTPVersion)
            @socket.writeline "Host: #{@address}:#{@port}"
            if proxy_user
              credential = ["#{proxy_user}:#{proxy_pass}"].pack('m')
              credential.delete!("\r\n")
              @socket.writeline "Proxy-Authorization: Basic #{credential}"
            end
            @socket.writeline ''
            HTTPResponse.read_new(@socket).value
          end
          timeout(@open_timeout) { s.connect }
          if @ssl_context.verify_mode != OpenSSL::SSL::VERIFY_NONE
            s.post_connection_check(@address)
          end
        rescue => exception
          D "Conn close because of connect error #{exception}"
          @socket.close if @socket and not @socket.closed?
          raise exception
        end
      end
      on_connect
    end
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