# File lib/restclient/request.rb, line 141
    def transmit uri, req, payload, & block
      setup_credentials req

      net = net_http_class.new(uri.host, uri.port)
      net.use_ssl = uri.is_a?(URI::HTTPS)
      if @verify_ssl == false
        net.verify_mode = OpenSSL::SSL::VERIFY_NONE
      elsif @verify_ssl.is_a? Integer
        net.verify_mode = @verify_ssl
        net.verify_callback = lambda do |preverify_ok, ssl_context|
          if (!preverify_ok) || ssl_context.error != 0
            err_msg = "SSL Verification failed -- Preverify: #{preverify_ok}, Error: #{ssl_context.error_string} (#{ssl_context.error})"
            raise SSLCertificateNotVerified.new(err_msg)
          end
          true
        end
      end
      net.cert = @ssl_client_cert if @ssl_client_cert
      net.key = @ssl_client_key if @ssl_client_key
      net.ca_file = @ssl_ca_file if @ssl_ca_file
      net.read_timeout = @timeout if @timeout
      net.open_timeout = @open_timeout if @open_timeout

      RestClient.before_execution_procs.each do |before_proc|
        before_proc.call(req, args)
      end

      log_request

      net.start do |http|
        if @block_response
          http.request(req, payload ? payload.to_s : nil, & @block_response)
        else
          res = http.request(req, payload ? payload.to_s : nil) { |http_response| fetch_body(http_response) }
          log_response res
          process_result res, & block
        end
      end
    rescue EOFError
      raise RestClient::ServerBrokeConnection
    rescue Timeout::Error
      raise RestClient::RequestTimeout
    end