.htaccess: How to “Specify a cache validator”?

Question

I\'m running Google PageSpeed on my site and it\'s tell me that I need to
\"Specify a cache validator.\"

The following resources are missing a cache validator. R

Answer 1

I think the problem you are having is with Expire: and not with Last-Modified:. Apache would by default send the file Last-Modified: header based on the file date. I suggest removing the upper code and replacing it with the following:

    ExpiresActive On
    ExpiresDefault "access plus 1 year"

Try with that, if it didn't work try adding this as well:

    
        Header set Last-Modified "Mon, 31 Aug 2009 00:00:00 GMT"