Boost

Boost Apache .htaccess settings generation
Explanation of .htaccess variables

Be sure to save the configuration and then go to the htaccess rules generation page and copy the rules.
Apache 2.4 users should uncomment the two marked sections, each line beginning with #
Best to leave these as %{}, only try the last option(s) if boost is still not working.
Value of %{DOCUMENT_ROOT} is recommended for this server.
Uses FileETag Directive to set ETags for the files cached by Boost. More info on this subject
In order to identify that the page is being served from the cache, Boost can send out a header that will identify any files served from the boost cache.
Ticking this is recommended if you use the securepages module.
Depending on your i18n settings you might want this disabled or enabled. X is set below
Depending on your i18n settings you might want this disabled or enabled.