[rb] fix bug with unnecessary conversion

Author: titusfortner

rb/lib/selenium/webdriver/remote/http/default.rb

@@ -100,8 +100,7 @@ def request(verb, url, headers, payload, redirects = 0)
 
               request(:get, URI.parse(response['Location']), DEFAULT_HEADERS.dup, nil, redirects + 1)
             else
-              header = response.instance_variable_get(:@header).to_yaml
-              WebDriver.logger.debug("   <<<  #{header.inspect}")
+              WebDriver.logger.debug("   <<<  #{response.instance_variable_get(:@header).inspect}")
               create_response response.code, response.body, response.content_type
             end
           end