Boost is not working properly I am using Drupal 7.
I have installed Boost module and configured properly as per the guidelines from Drupal.org site and other sources.
As per my knowledge to test whether boost is working or not we have to check html source code of any page because Boost module adds Boost tags in the html output generated by drupal.
When i check page source i don't find any boost tags.
I also have one doubt regarding the configuration, in .htaccess generation page there are three options

%{HTTP_HOST}
%{SERVER_NAME}
localhost

which one should i enable when i am configuring on the site like http://xyz.com/mydrupal
where mydrupal contains drupal setup and all the files
%{HTTP_HOST} is the default and it usually works. The other 2 options are there in case http_host doesn't work. Every hosting environment is different; that's why there are options.