Httpd configuration for including expire times in response http header

• 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.
  ExpiresActive On
  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