- First, you need to compile httpd using --enable-expires option. Then it's compiled with expire module built-in your httpd binary(You can check it like, > httpd -l).
- Second, configuration file should include following setting.
ExpireByType image/gif A25920000
ExpireByType image/png A25920000
ExpireByType image/jpg A25920000
ExpireByType image/jpeg A25920000
This means image file has its expire time as 2592000 seconds later (one month from now)
- Now, you can check whether expire information is included in the response header like below