How do I enable If Modified Since headers?
On my php_info page I found this:
Directive | Local Value | Master Value
engine | 1 | 1
last_modified | 0 | 0
xbithack | 0 | 0
In order to enable If Modified Since headers, do I need to change the values of last_modified to 1? If so, how do I go about this. If not, what other steps do I need to take in enabling If Modified Since headers?
I didnt have any luck finding my answer on Google but feel free to point me in the right direction if the answer is already out there somewhere.