Clean Response is a special plugin that allows you to protect data by hiding the version of Joomla in the code page. When using GZIP compression, Joomla adds the X-Content-Encoded response to the page header with a value of versions of this CMS that may affect the attack of hackers and other unwanted guests. Advanced users will find what made your website and try to hack it.

Clean Response clean response for CMS Joomla

Note: for users of Joomla 3+ this plugin is not needed!
Install in the General settings for metadata – not to show the version of Joomla. Of course, it will not remove all your problems with site security, but will help to protect him.
Advantages
Data protection about the version of Joomla.
Simple plug-in.
Simple integration into the available settings and parameters.